what is the meaning of assignment in psychology

Random Assignment in Psychology (Definition + 40 Examples)

Have you ever wondered how researchers discover new ways to help people learn, make decisions, or overcome challenges? A hidden hero in this adventure of discovery is a method called random assignment, a cornerstone in psychological research that helps scientists uncover the truths about the human mind and behavior.

Random Assignment is a process used in research where each participant has an equal chance of being placed in any group within the study. This technique is essential in experiments as it helps to eliminate biases, ensuring that the different groups being compared are similar in all important aspects.

By doing so, researchers can be confident that any differences observed are likely due to the variable being tested, rather than other factors.

In this article, we’ll explore the intriguing world of random assignment, diving into its history, principles, real-world examples, and the impact it has had on the field of psychology.

History of Random Assignment

Stepping back in time, we delve into the origins of random assignment, which finds its roots in the early 20th century.

The pioneering mind behind this innovative technique was Sir Ronald A. Fisher , a British statistician and biologist. Fisher introduced the concept of random assignment in the 1920s, aiming to improve the quality and reliability of experimental research .

His contributions laid the groundwork for the method's evolution and its widespread adoption in various fields, particularly in psychology.

Fisher’s groundbreaking work on random assignment was motivated by his desire to control for confounding variables – those pesky factors that could muddy the waters of research findings.

By assigning participants to different groups purely by chance, he realized that the influence of these confounding variables could be minimized, paving the way for more accurate and trustworthy results.

Early Studies Utilizing Random Assignment

Following Fisher's initial development, random assignment started to gain traction in the research community. Early studies adopting this methodology focused on a variety of topics, from agriculture (which was Fisher’s primary field of interest) to medicine and psychology.

The approach allowed researchers to draw stronger conclusions from their experiments, bolstering the development of new theories and practices.

One notable early study utilizing random assignment was conducted in the field of educational psychology. Researchers were keen to understand the impact of different teaching methods on student outcomes.

By randomly assigning students to various instructional approaches, they were able to isolate the effects of the teaching methods, leading to valuable insights and recommendations for educators.

Evolution of the Methodology

As the decades rolled on, random assignment continued to evolve and adapt to the changing landscape of research.

Advances in technology introduced new tools and techniques for implementing randomization, such as computerized random number generators, which offered greater precision and ease of use.

The application of random assignment expanded beyond the confines of the laboratory, finding its way into field studies and large-scale surveys.

Researchers across diverse disciplines embraced the methodology, recognizing its potential to enhance the validity of their findings and contribute to the advancement of knowledge.

From its humble beginnings in the early 20th century to its widespread use today, random assignment has proven to be a cornerstone of scientific inquiry.

Its development and evolution have played a pivotal role in shaping the landscape of psychological research, driving discoveries that have improved lives and deepened our understanding of the human experience.

Principles of Random Assignment

Delving into the heart of random assignment, we uncover the theories and principles that form its foundation.

The method is steeped in the basics of probability theory and statistical inference, ensuring that each participant has an equal chance of being placed in any group, thus fostering fair and unbiased results.

Basic Principles of Random Assignment

Understanding the core principles of random assignment is key to grasping its significance in research. There are three principles: equal probability of selection, reduction of bias, and ensuring representativeness.

The first principle, equal probability of selection , ensures that every participant has an identical chance of being assigned to any group in the study. This randomness is crucial as it mitigates the risk of bias and establishes a level playing field.

The second principle focuses on the reduction of bias . Random assignment acts as a safeguard, ensuring that the groups being compared are alike in all essential aspects before the experiment begins.

This similarity between groups allows researchers to attribute any differences observed in the outcomes directly to the independent variable being studied.

Lastly, ensuring representativeness is a vital principle. When participants are assigned randomly, the resulting groups are more likely to be representative of the larger population.

This characteristic is crucial for the generalizability of the study’s findings, allowing researchers to apply their insights broadly.

Theoretical Foundation

The theoretical foundation of random assignment lies in probability theory and statistical inference .

Probability theory deals with the likelihood of different outcomes, providing a mathematical framework for analyzing random phenomena. In the context of random assignment, it helps in ensuring that each participant has an equal chance of being placed in any group.

Statistical inference, on the other hand, allows researchers to draw conclusions about a population based on a sample of data drawn from that population. It is the mechanism through which the results of a study can be generalized to a broader context.

Random assignment enhances the reliability of statistical inferences by reducing biases and ensuring that the sample is representative.

Differentiating Random Assignment from Random Selection

It’s essential to distinguish between random assignment and random selection, as the two terms, while related, have distinct meanings in the realm of research.

Random assignment refers to how participants are placed into different groups in an experiment, aiming to control for confounding variables and help determine causes.

In contrast, random selection pertains to how individuals are chosen to participate in a study. This method is used to ensure that the sample of participants is representative of the larger population, which is vital for the external validity of the research.

While both methods are rooted in randomness and probability, they serve different purposes in the research process.

Understanding the theories, principles, and distinctions of random assignment illuminates its pivotal role in psychological research.

This method, anchored in probability theory and statistical inference, serves as a beacon of reliability, guiding researchers in their quest for knowledge and ensuring that their findings stand the test of validity and applicability.

Methodology of Random Assignment

Implementing random assignment in a study is a meticulous process that involves several crucial steps.

The initial step is participant selection, where individuals are chosen to partake in the study. This stage is critical to ensure that the pool of participants is diverse and representative of the population the study aims to generalize to.

Once the pool of participants has been established, the actual assignment process begins. In this step, each participant is allocated randomly to one of the groups in the study.

Researchers use various tools, such as random number generators or computerized methods, to ensure that this assignment is genuinely random and free from biases.

Monitoring and adjusting form the final step in the implementation of random assignment. Researchers need to continuously observe the groups to ensure that they remain comparable in all essential aspects throughout the study.

If any significant discrepancies arise, adjustments might be necessary to maintain the study’s integrity and validity.

Tools and Techniques Used

The evolution of technology has introduced a variety of tools and techniques to facilitate random assignment.

Random number generators, both manual and computerized, are commonly used to assign participants to different groups. These generators ensure that each individual has an equal chance of being placed in any group, upholding the principle of equal probability of selection.

In addition to random number generators, researchers often use specialized computer software designed for statistical analysis and experimental design.

These software programs offer advanced features that allow for precise and efficient random assignment, minimizing the risk of human error and enhancing the study’s reliability.

Ethical Considerations

The implementation of random assignment is not devoid of ethical considerations. Informed consent is a fundamental ethical principle that researchers must uphold.

Informed consent means that every participant should be fully informed about the nature of the study, the procedures involved, and any potential risks or benefits, ensuring that they voluntarily agree to participate.

Beyond informed consent, researchers must conduct a thorough risk and benefit analysis. The potential benefits of the study should outweigh any risks or harms to the participants.

Safeguarding the well-being of participants is paramount, and any study employing random assignment must adhere to established ethical guidelines and standards.

Conclusion of Methodology

The methodology of random assignment, while seemingly straightforward, is a multifaceted process that demands precision, fairness, and ethical integrity. From participant selection to assignment and monitoring, each step is crucial to ensure the validity of the study’s findings.

The tools and techniques employed, coupled with a steadfast commitment to ethical principles, underscore the significance of random assignment as a cornerstone of robust psychological research.

Benefits of Random Assignment in Psychological Research

The impact and importance of random assignment in psychological research cannot be overstated. It is fundamental for ensuring the study is accurate, allowing the researchers to determine if their study actually caused the results they saw, and making sure the findings can be applied to the real world.

Facilitating Causal Inferences

When participants are randomly assigned to different groups, researchers can be more confident that the observed effects are due to the independent variable being changed, and not other factors.

This ability to determine the cause is called causal inference .

This confidence allows for the drawing of causal relationships, which are foundational for theory development and application in psychology.

Ensuring Internal Validity

One of the foremost impacts of random assignment is its ability to enhance the internal validity of an experiment.

Internal validity refers to the extent to which a researcher can assert that changes in the dependent variable are solely due to manipulations of the independent variable , and not due to confounding variables.

By ensuring that each participant has an equal chance of being in any condition of the experiment, random assignment helps control for participant characteristics that could otherwise complicate the results.

Enhancing Generalizability

Beyond internal validity, random assignment also plays a crucial role in enhancing the generalizability of research findings.

When done correctly, it ensures that the sample groups are representative of the larger population, so can allow researchers to apply their findings more broadly.

This representative nature is essential for the practical application of research, impacting policy, interventions, and psychological therapies.

Limitations of Random Assignment

Potential for implementation issues.

While the principles of random assignment are robust, the method can face implementation issues.

One of the most common problems is logistical constraints. Some studies, due to their nature or the specific population being studied, find it challenging to implement random assignment effectively.

For instance, in educational settings, logistical issues such as class schedules and school policies might stop the random allocation of students to different teaching methods .

Ethical Dilemmas

Random assignment, while methodologically sound, can also present ethical dilemmas.

In some cases, withholding a potentially beneficial treatment from one of the groups of participants can raise serious ethical questions, especially in medical or clinical research where participants' well-being might be directly affected.

Researchers must navigate these ethical waters carefully, balancing the pursuit of knowledge with the well-being of participants.

Generalizability Concerns

Even when implemented correctly, random assignment does not always guarantee generalizable results.

The types of people in the participant pool, the specific context of the study, and the nature of the variables being studied can all influence the extent to which the findings can be applied to the broader population.

Researchers must be cautious in making broad generalizations from studies, even those employing strict random assignment.

Practical and Real-World Limitations

In the real world, many variables cannot be manipulated for ethical or practical reasons, limiting the applicability of random assignment.

For instance, researchers cannot randomly assign individuals to different levels of intelligence, socioeconomic status, or cultural backgrounds.

This limitation necessitates the use of other research designs, such as correlational or observational studies , when exploring relationships involving such variables.

Response to Critiques

In response to these critiques, people in favor of random assignment argue that the method, despite its limitations, remains one of the most reliable ways to establish cause and effect in experimental research.

They acknowledge the challenges and ethical considerations but emphasize the rigorous frameworks in place to address them.

The ongoing discussion around the limitations and critiques of random assignment contributes to the evolution of the method, making sure it is continuously relevant and applicable in psychological research.

While random assignment is a powerful tool in experimental research, it is not without its critiques and limitations. Implementation issues, ethical dilemmas, generalizability concerns, and real-world limitations can pose significant challenges.

However, the continued discourse and refinement around these issues underline the method's enduring significance in the pursuit of knowledge in psychology.

By being careful with how we do things and doing what's right, random assignment stays a really important part of studying how people act and think.

Real-World Applications and Examples

Random assignment has been employed in many studies across various fields of psychology, leading to significant discoveries and advancements.

Here are some real-world applications and examples illustrating the diversity and impact of this method:

• Medicine and Health Psychology: Randomized Controlled Trials (RCTs) are the gold standard in medical research. In these studies, participants are randomly assigned to either the treatment or control group to test the efficacy of new medications or interventions.
• Educational Psychology: Studies in this field have used random assignment to explore the effects of different teaching methods, classroom environments, and educational technologies on student learning and outcomes.
• Cognitive Psychology: Researchers have employed random assignment to investigate various aspects of human cognition, including memory, attention, and problem-solving, leading to a deeper understanding of how the mind works.
• Social Psychology: Random assignment has been instrumental in studying social phenomena, such as conformity, aggression, and prosocial behavior, shedding light on the intricate dynamics of human interaction.

Let's get into some specific examples. You'll need to know one term though, and that is "control group." A control group is a set of participants in a study who do not receive the treatment or intervention being tested , serving as a baseline to compare with the group that does, in order to assess the effectiveness of the treatment.

• Smoking Cessation Study: Researchers used random assignment to put participants into two groups. One group received a new anti-smoking program, while the other did not. This helped determine if the program was effective in helping people quit smoking.
• Math Tutoring Program: A study on students used random assignment to place them into two groups. One group received additional math tutoring, while the other continued with regular classes, to see if the extra help improved their grades.
• Exercise and Mental Health: Adults were randomly assigned to either an exercise group or a control group to study the impact of physical activity on mental health and mood.
• Diet and Weight Loss: A study randomly assigned participants to different diet plans to compare their effectiveness in promoting weight loss and improving health markers.
• Sleep and Learning: Researchers randomly assigned students to either a sleep extension group or a regular sleep group to study the impact of sleep on learning and memory.
• Classroom Seating Arrangement: Teachers used random assignment to place students in different seating arrangements to examine the effect on focus and academic performance.
• Music and Productivity: Employees were randomly assigned to listen to music or work in silence to investigate the effect of music on workplace productivity.
• Medication for ADHD: Children with ADHD were randomly assigned to receive either medication, behavioral therapy, or a placebo to compare treatment effectiveness.
• Mindfulness Meditation for Stress: Adults were randomly assigned to a mindfulness meditation group or a waitlist control group to study the impact on stress levels.
• Video Games and Aggression: A study randomly assigned participants to play either violent or non-violent video games and then measured their aggression levels.
• Online Learning Platforms: Students were randomly assigned to use different online learning platforms to evaluate their effectiveness in enhancing learning outcomes.
• Hand Sanitizers in Schools: Schools were randomly assigned to use hand sanitizers or not to study the impact on student illness and absenteeism.
• Caffeine and Alertness: Participants were randomly assigned to consume caffeinated or decaffeinated beverages to measure the effects on alertness and cognitive performance.
• Green Spaces and Well-being: Neighborhoods were randomly assigned to receive green space interventions to study the impact on residents’ well-being and community connections.
• Pet Therapy for Hospital Patients: Patients were randomly assigned to receive pet therapy or standard care to assess the impact on recovery and mood.
• Yoga for Chronic Pain: Individuals with chronic pain were randomly assigned to a yoga intervention group or a control group to study the effect on pain levels and quality of life.
• Flu Vaccines Effectiveness: Different groups of people were randomly assigned to receive either the flu vaccine or a placebo to determine the vaccine’s effectiveness.
• Reading Strategies for Dyslexia: Children with dyslexia were randomly assigned to different reading intervention strategies to compare their effectiveness.
• Physical Environment and Creativity: Participants were randomly assigned to different room setups to study the impact of physical environment on creative thinking.
• Laughter Therapy for Depression: Individuals with depression were randomly assigned to laughter therapy sessions or control groups to assess the impact on mood.
• Financial Incentives for Exercise: Participants were randomly assigned to receive financial incentives for exercising to study the impact on physical activity levels.
• Art Therapy for Anxiety: Individuals with anxiety were randomly assigned to art therapy sessions or a waitlist control group to measure the effect on anxiety levels.
• Natural Light in Offices: Employees were randomly assigned to workspaces with natural or artificial light to study the impact on productivity and job satisfaction.
• School Start Times and Academic Performance: Schools were randomly assigned different start times to study the effect on student academic performance and well-being.
• Horticulture Therapy for Seniors: Older adults were randomly assigned to participate in horticulture therapy or traditional activities to study the impact on cognitive function and life satisfaction.
• Hydration and Cognitive Function: Participants were randomly assigned to different hydration levels to measure the impact on cognitive function and alertness.
• Intergenerational Programs: Seniors and young people were randomly assigned to intergenerational programs to study the effects on well-being and cross-generational understanding.
• Therapeutic Horseback Riding for Autism: Children with autism were randomly assigned to therapeutic horseback riding or traditional therapy to study the impact on social communication skills.
• Active Commuting and Health: Employees were randomly assigned to active commuting (cycling, walking) or passive commuting to study the effect on physical health.
• Mindful Eating for Weight Management: Individuals were randomly assigned to mindful eating workshops or control groups to study the impact on weight management and eating habits.
• Noise Levels and Learning: Students were randomly assigned to classrooms with different noise levels to study the effect on learning and concentration.
• Bilingual Education Methods: Schools were randomly assigned different bilingual education methods to compare their effectiveness in language acquisition.
• Outdoor Play and Child Development: Children were randomly assigned to different amounts of outdoor playtime to study the impact on physical and cognitive development.
• Social Media Detox: Participants were randomly assigned to a social media detox or regular usage to study the impact on mental health and well-being.
• Therapeutic Writing for Trauma Survivors: Individuals who experienced trauma were randomly assigned to therapeutic writing sessions or control groups to study the impact on psychological well-being.
• Mentoring Programs for At-risk Youth: At-risk youth were randomly assigned to mentoring programs or control groups to assess the impact on academic achievement and behavior.
• Dance Therapy for Parkinson’s Disease: Individuals with Parkinson’s disease were randomly assigned to dance therapy or traditional exercise to study the effect on motor function and quality of life.
• Aquaponics in Schools: Schools were randomly assigned to implement aquaponics programs to study the impact on student engagement and environmental awareness.
• Virtual Reality for Phobia Treatment: Individuals with phobias were randomly assigned to virtual reality exposure therapy or traditional therapy to compare effectiveness.
• Gardening and Mental Health: Participants were randomly assigned to engage in gardening or other leisure activities to study the impact on mental health and stress reduction.

Each of these studies exemplifies how random assignment is utilized in various fields and settings, shedding light on the multitude of ways it can be applied to glean valuable insights and knowledge.

Real-world Impact of Random Assignment

Random assignment is like a key tool in the world of learning about people's minds and behaviors. It’s super important and helps in many different areas of our everyday lives. It helps make better rules, creates new ways to help people, and is used in lots of different fields.

Health and Medicine

In health and medicine, random assignment has helped doctors and scientists make lots of discoveries. It’s a big part of tests that help create new medicines and treatments.

By putting people into different groups by chance, scientists can really see if a medicine works.

This has led to new ways to help people with all sorts of health problems, like diabetes, heart disease, and mental health issues like depression and anxiety.

Schools and education have also learned a lot from random assignment. Researchers have used it to look at different ways of teaching, what kind of classrooms are best, and how technology can help learning.

This knowledge has helped make better school rules, develop what we learn in school, and find the best ways to teach students of all ages and backgrounds.

Workplace and Organizational Behavior

Random assignment helps us understand how people act at work and what makes a workplace good or bad.

Studies have looked at different kinds of workplaces, how bosses should act, and how teams should be put together. This has helped companies make better rules and create places to work that are helpful and make people happy.

Environmental and Social Changes

Random assignment is also used to see how changes in the community and environment affect people. Studies have looked at community projects, changes to the environment, and social programs to see how they help or hurt people’s well-being.

This has led to better community projects, efforts to protect the environment, and programs to help people in society.

Technology and Human Interaction

In our world where technology is always changing, studies with random assignment help us see how tech like social media, virtual reality, and online stuff affect how we act and feel.

This has helped make better and safer technology and rules about using it so that everyone can benefit.

The effects of random assignment go far and wide, way beyond just a science lab. It helps us understand lots of different things, leads to new and improved ways to do things, and really makes a difference in the world around us.

From making healthcare and schools better to creating positive changes in communities and the environment, the real-world impact of random assignment shows just how important it is in helping us learn and make the world a better place.

So, what have we learned? Random assignment is like a super tool in learning about how people think and act. It's like a detective helping us find clues and solve mysteries in many parts of our lives.

From creating new medicines to helping kids learn better in school, and from making workplaces happier to protecting the environment, it’s got a big job!

This method isn’t just something scientists use in labs; it reaches out and touches our everyday lives. It helps make positive changes and teaches us valuable lessons.

Whether we are talking about technology, health, education, or the environment, random assignment is there, working behind the scenes, making things better and safer for all of us.

In the end, the simple act of putting people into groups by chance helps us make big discoveries and improvements. It’s like throwing a small stone into a pond and watching the ripples spread out far and wide.

Thanks to random assignment, we are always learning, growing, and finding new ways to make our world a happier and healthier place for everyone!

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Purpose and Limitations of Random Assignment

In an experimental study, random assignment is a process by which participants are assigned, with the same chance, to either a treatment or a control group. The goal is to assure an unbiased assignment of participants to treatment options.

Random assignment is considered the gold standard for achieving comparability across study groups, and therefore is the best method for inferring a causal relationship between a treatment (or intervention or risk factor) and an outcome.

Random assignment of participants produces comparable groups regarding the participants’ initial characteristics, thereby any difference detected in the end between the treatment and the control group will be due to the effect of the treatment alone.

How does random assignment produce comparable groups?

1. random assignment prevents selection bias.

Randomization works by removing the researcher’s and the participant’s influence on the treatment allocation. So the allocation can no longer be biased since it is done at random, i.e. in a non-predictable way.

This is in contrast with the real world, where for example, the sickest people are more likely to receive the treatment.

2. Random assignment prevents confounding

A confounding variable is one that is associated with both the intervention and the outcome, and thus can affect the outcome in 2 ways:

Either directly:

Or indirectly through the treatment:

This indirect relationship between the confounding variable and the outcome can cause the treatment to appear to have an influence on the outcome while in reality the treatment is just a mediator of that effect (as it happens to be on the causal pathway between the confounder and the outcome).

Random assignment eliminates the influence of the confounding variables on the treatment since it distributes them at random between the study groups, therefore, ruling out this alternative path or explanation of the outcome.

3. Random assignment also eliminates other threats to internal validity

By distributing all threats (known and unknown) at random between study groups, participants in both the treatment and the control group become equally subject to the effect of any threat to validity. Therefore, comparing the outcome between the 2 groups will bypass the effect of these threats and will only reflect the effect of the treatment on the outcome.

These threats include:

• History: This is any event that co-occurs with the treatment and can affect the outcome.
• Maturation: This is the effect of time on the study participants (e.g. participants becoming wiser, hungrier, or more stressed with time) which might influence the outcome.
• Regression to the mean: This happens when the participants’ outcome score is exceptionally good on a pre-treatment measurement, so the post-treatment measurement scores will naturally regress toward the mean — in simple terms, regression happens since an exceptional performance is hard to maintain. This effect can bias the study since it represents an alternative explanation of the outcome.

Note that randomization does not prevent these effects from happening, it just allows us to control them by reducing their risk of being associated with the treatment.

What if random assignment produced unequal groups?

Question: What should you do if after randomly assigning participants, it turned out that the 2 groups still differ in participants’ characteristics? More precisely, what if randomization accidentally did not balance risk factors that can be alternative explanations between the 2 groups? (For example, if one group includes more male participants, or sicker, or older people than the other group).

Short answer: This is perfectly normal, since randomization only assures an unbiased assignment of participants to groups, i.e. it produces comparable groups, but it does not guarantee the equality of these groups.

A more complete answer: Randomization will not and cannot create 2 equal groups regarding each and every characteristic. This is because when dealing with randomization there is still an element of luck. If you want 2 perfectly equal groups, you better match them manually as is done in a matched pairs design (for more information see my article on matched pairs design ).

This is similar to throwing a die: If you throw it 10 times, the chance of getting a specific outcome will not be 1/6. But it will approach 1/6 if you repeat the experiment a very large number of times and calculate the average number of times the specific outcome turned up.

So randomization will not produce perfectly equal groups for each specific study, especially if the study has a small sample size. But do not forget that scientific evidence is a long and continuous process, and the groups will tend to be equal in the long run when a meta-analysis aggregates the results of a large number of randomized studies.

So for each individual study, differences between the treatment and control group will exist and will influence the study results. This means that the results of a randomized trial will sometimes be wrong, and this is absolutely okay.

BOTTOM LINE:

Although the results of a particular randomized study are unbiased, they will still be affected by a sampling error due to chance. But the real benefit of random assignment will be when data is aggregated in a meta-analysis.

Limitations of random assignment

Randomized designs can suffer from:

1. Ethical issues:

Randomization is ethical only if the researcher has no evidence that one treatment is superior to the other.

Also, it would be unethical to randomly assign participants to harmful exposures such as smoking or dangerous chemicals.

2. Low external validity:

With random assignment, external validity (i.e. the generalizability of the study results) is compromised because the results of a study that uses random assignment represent what would happen under “ideal” experimental conditions, which is in general very different from what happens at the population level.

In the real world, people who take the treatment might be very different from those who don’t – so the assignment of participants is not a random event, but rather under the influence of all sort of external factors.

External validity can be also jeopardized in cases where not all participants are eligible or willing to accept the terms of the study.

3. Higher cost of implementation:

An experimental design with random assignment is typically more expensive than observational studies where the investigator’s role is just to observe events without intervening.

Experimental designs also typically take a lot of time to implement, and therefore are less practical when a quick answer is needed.

4. Impracticality when answering non-causal questions:

A randomized trial is our best bet when the question is to find the causal effect of a treatment or a risk factor.

Sometimes however, the researcher is just interested in predicting the probability of an event or a disease given some risk factors. In this case, the causal relationship between these variables is not important, making observational designs more suitable for such problems.

5. Impracticality when studying the effect of variables that cannot be manipulated:

The usual objective of studying the effects of risk factors is to propose recommendations that involve changing the level of exposure to these factors.

However, some risk factors cannot be manipulated, and so it does not make any sense to study them in a randomized trial. For example it would be impossible to randomly assign participants to age categories, gender, or genetic factors.

6. Difficulty to control participants:

These difficulties include:

• Participants refusing to receive the assigned treatment.
• Participants not adhering to recommendations.
• Differential loss to follow-up between those who receive the treatment and those who don’t.

All of these issues might occur in a randomized trial, but might not affect an observational study.

• Shadish WR, Cook TD, Campbell DT. Experimental and Quasi-Experimental Designs for Generalized Causal Inference . 2nd edition. Cengage Learning; 2001.
• Friedman LM, Furberg CD, DeMets DL, Reboussin DM, Granger CB. Fundamentals of Clinical Trials . 5th ed. 2015 edition. Springer; 2015.

Further reading

• Posttest-Only Control Group Design
• Pretest-Posttest Control Group Design
• Randomized Block Design

Random Assignment

• Reference work entry
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• Sven Hilbert 3 , 4 , 5  

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Random assignment defines the assignment of participants of a study to their respective group strictly by chance.

Introduction

Statistical inference is based on the theory of probability, and effects investigated in psychological studies are defined by measures that are treated as random variables. The inference about the probability of a given result with regard to an assumed population and the popular term “significance” are only meaningful and without bias if the measure of interest is really a random variable. To achieve the creation of a random variable in form of a measure derived from a sample of participants, these participants have to be randomly drawn. In an experimental study involving different groups of participants, these participants have to additionally be randomly assigned to one of the groups.

Why Is Random Assignment Crucial for Statistical Inference?

Many psychological investigations, such as clinical treatment studies or neuropsychological training...

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Gigerenzer, G., Swijtink, Z., Porter, T., Daston, L., Beatty, J., & Kruger, L. (1989). The empire of chance: How probability changed science and everyday-life . Cambridge: New York.

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Department of Psychology, Psychological Methods and Assessment, Münich, Germany

Sven Hilbert

Faculty of Psychology, Educational Science, and Sport Science, University of Regensburg, Regensburg, Germany

Psychological Methods and Assessment, LMU Munich, Munich, Germany

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Hilbert, S. (2020). Random Assignment. In: Zeigler-Hill, V., Shackelford, T.K. (eds) Encyclopedia of Personality and Individual Differences. Springer, Cham. https://doi.org/10.1007/978-3-319-24612-3_1343

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Chapter 1. Introducing Psychology

Psychology is the scientific study of mind and behavior . The word “psychology” comes from the Greek words “psyche,” meaning life , and “logos,” meaning explanation . Psychology is a popular major for students, a popular topic in the public media, and a part of our everyday lives. Television shows such as Dr. Phil feature psychologists who provide personal advice to those with personal or family difficulties. Crime dramas such as CSI , Lie to Me , and others feature the work of forensic psychologists who use psychological principles to help solve crimes. And many people have direct knowledge about psychology because they have visited psychologists, for instance, school counselors, family therapists, and religious, marriage, or bereavement counselors.

Because we are frequently exposed to the work of psychologists in our everyday lives, we all have an idea about what psychology is and what psychologists do. In many ways I am sure that your conceptions are correct. Psychologists do work in forensic fields, and they do provide counseling and therapy for people in distress. But there are hundreds of thousands of psychologists in the world, and most of them work in other places, doing work that you are probably not aware of.

Most psychologists work in research laboratories, hospitals, and other field settings where they study the behavior of humans and animals. For instance, my colleagues in the Psychology Department at the University of Maryland study such diverse topics as anxiety in children, the interpretation of dreams, the effects of caffeine on thinking, how birds recognize each other, how praying mantises hear, how people from different cultures react differently in negotiation, and the factors that lead people to engage in terrorism. Other psychologists study such topics as alcohol and drug addiction, memory, emotion, hypnosis, love, what makes people aggressive or helpful, and the psychologies of politics, prejudice, culture, and religion. Psychologists also work in schools and businesses, and they use a variety of methods, including observation, questionnaires, interviews, and laboratory studies, to help them understand behavior.

This chapter provides an introduction to the broad field of psychology and the many approaches that psychologists take to understanding human behavior. We will consider how psychologists conduct scientific research, with an overview of some of the most important approaches used and topics studied by psychologists, and also consider the variety of fields in which psychologists work and the careers that are available to people with psychology degrees. I expect that you may find that at least some of your preconceptions about psychology will be challenged and changed, and you will learn that psychology is a field that will provide you with new ways of thinking about your own thoughts, feelings, and actions.

Psychology is in part the study of behavior. Why do you think these people are behaving the way they are?

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1.1 What Is Psychology?

Learning objectives.

By the end of this section, you will be able to:

• Define psychology
• Understand the merits of an education in psychology

What is creativity? What are prejudice and discrimination? What is consciousness? The field of psychology explores questions like these. Psychology refers to the scientific study of the mind and behavior. Psychologists use the scientific method to acquire knowledge. To apply the scientific method, a researcher with a question about how or why something happens will propose a tentative explanation, called a hypothesis, to explain the phenomenon. A hypothesis should fit into the context of a scientific theory, which is a broad explanation or group of explanations for some aspect of the natural world that is consistently supported by evidence over time. A theory is the best understanding we have of that part of the natural world. The researcher then makes observations or carries out an experiment to test the validity of the hypothesis. Those results are then published or presented at research conferences so that others can replicate or build on the results.

Scientists test that which is perceivable and measurable. For example, the hypothesis that a bird sings because it is happy is not a hypothesis that can be tested since we have no way to measure the happiness of a bird. We must ask a different question, perhaps about the brain state of the bird, since this can be measured. However, we can ask individuals about whether they sing because they are happy since they are able to tell us. Thus, psychological science is empirical, based on measurable data.

In general, science deals only with matter and energy, that is, those things that can be measured, and it cannot arrive at knowledge about values and morality. This is one reason why our scientific understanding of the mind is so limited, since thoughts, at least as we experience them, are neither matter nor energy. The scientific method is also a form of empiricism. An empirical method for acquiring knowledge is one based on observation, including experimentation, rather than a method based only on forms of logical argument or previous authorities.

It was not until the late 1800s that psychology became accepted as its own academic discipline. Before this time, the workings of the mind were considered under the auspices of philosophy. Given that any behavior is, at its roots, biological, some areas of psychology take on aspects of a natural science like biology. No biological organism exists in isolation, and our behavior is influenced by our interactions with others. Therefore, psychology is also a social science.

WHY STUDY PSYCHOLOGY?

Often, students take their first psychology course because they are interested in helping others and want to learn more about themselves and why they act the way they do. Sometimes, students take a psychology course because it either satisfies a general education requirement or is required for a program of study such as nursing or pre-med. Many of these students develop such an interest in the area that they go on to declare psychology as their major. As a result, psychology is one of the most popular majors on college campuses across the United States (Johnson & Lubin, 2011). A number of well-known individuals were psychology majors. Just a few famous names on this list are Facebook’s creator Mark Zuckerberg, television personality and political satirist Jon Stewart, actress Natalie Portman, and filmmaker Wes Craven (Halonen, 2011). About 6 percent of all bachelor degrees granted in the United States are in the discipline of psychology (U.S. Department of Education, 2016).

An education in psychology is valuable for a number of reasons. Psychology students hone critical thinking skills and are trained in the use of the scientific method. Critical thinking is the active application of a set of skills to information for the understanding and evaluation of that information. The evaluation of information—assessing its reliability and usefulness— is an important skill in a world full of competing “facts,” many of which are designed to be misleading. For example, critical thinking involves maintaining an attitude of skepticism, recognizing internal biases, making use of logical thinking, asking appropriate questions, and making observations. Psychology students also can develop better communication skills during the course of their undergraduate coursework (American Psychological Association, 2011). Together, these factors increase students’ scientific literacy and prepare students to critically evaluate the various sources of information they encounter.

In addition to these broad-based skills, psychology students come to understand the complex factors that shape one’s behavior. They appreciate the interaction of our biology, our environment, and our experiences in determining who we are and how we will behave. They learn about basic principles that guide how we think and behave, and they come to recognize the tremendous diversity that exists across individuals and across cultural boundaries (American Psychological Association, 2011).

Link to Learning

Watch a brief video about some questions to consider before deciding to major in psychology to learn more.

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Writing in Psychology Overview

Welcome to the Purdue OWL

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Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

Psychology is based on the study of human behaviors. As a social science, experimental psychology uses empirical inquiry to help understand human behavior. According to Thrass and Sanford (2000), psychology writing has three elements: describing, explaining, and understanding concepts from a standpoint of empirical investigation.

Discipline-specific writing, such as writing done in psychology, can be similar to other types of writing you have done in the use of the writing process, writing techniques, and in locating and integrating sources. However, the field of psychology also has its own rules and expectations for writing; not everything that you have learned in about writing in the past works for the field of psychology.

Writing in psychology includes the following principles:

• Using plain language : Psychology writing is formal scientific writing that is plain and straightforward. Literary devices such as metaphors, alliteration, or anecdotes are not appropriate for writing in psychology.
• Conciseness and clarity of language : The field of psychology stresses clear, concise prose. You should be able to make connections between empirical evidence, theories, and conclusions. See our OWL handout on conciseness for more information.
• Evidence-based reasoning: Psychology bases its arguments on empirical evidence. Personal examples, narratives, or opinions are not appropriate for psychology.
• Use of APA format: Psychologists use the American Psychological Association (APA) format for publications. While most student writing follows this format, some instructors may provide you with specific formatting requirements that differ from APA format .

Types of writing

Most major writing assignments in psychology courses consists of one of the following two types.

Experimental reports: Experimental reports detail the results of experimental research projects and are most often written in experimental psychology (lab) courses. Experimental reports are write-ups of your results after you have conducted research with participants. This handout provides a description of how to write an experimental report .

Critical analyses or reviews of research : Often called "term papers," a critical analysis of research narrowly examines and draws conclusions from existing literature on a topic of interest. These are frequently written in upper-division survey courses. Our research paper handouts provide a detailed overview of how to write these types of research papers.

Rosie Psychology: Your online tutor

How to demonstrate critical evaluation in your psychology assignments

Thinking critically about psychology research

Critical thinking is often taught in undergraduate psychology degrees, and is a key marking criteria for higher marks in many assignments. But getting your head around how to write critically can sometimes be difficult. It can take practice. The aim of this short blog is to provide an introduction to critical evaluation, and how to start including evidence of critical evaluation in your psychology assignments.

So what does “critical evaluation” really mean?

Broadly speaking, critical evaluation is the process of thinking and writing critically about the quality of the sources of evidence used to support or refute an argument. By “ evidence “, I mean the literature you cite (e.g., a journal article or book chapter). By “ quality   of the evidence “, I mean thinking about whether this topic has been tested is in a robust way. If the quality of the sources is poor, then this could suggest poor support for your argument, and vice versa. Even if the quality is poor, this is important to discuss in your assignments as evidence of critical thinking in this way!

In the rest of this blog, I outline a few different ways you can start to implement critical thinking into your work and reading of psychology. I talk about the quality of the evidence, a few pointers for critiquing the methods, theoretical and practical critical evaluation too. This is not an exhaustive list, but hopefully it’ll help you to start getting those higher-level marks in psychology. I also include an example write-up at the end to illustrate how to write all of this up!

The quality of the evidence

There are different types of study designs in psychology research, but some are of higher quality than others. The higher the quality of the evidence, the stronger the support for your argument the research offers, because the idea has been tested more rigorously. The pyramid image below can really help to explain what we mean by “quality of evidence”, by showing different study designs in the order of their quality. 

Not every area of psychology is going to be full of high quality studies, and even the strongest sources of evidence (i.e., systematic reviews and/or meta-analyses) can have limitations! Because no study is perfect, it can be a good habit to tell the reader, in your report, (i) what the  design  of the study is that you’re citing, AND, (ii)  how  this affects your argument. Doing so would be evidence of critical thought. (See an example write-up below for implementing this, but do not copy and paste it!) 

But first, what do I mean by “design”? The design of the study refers to  how  the study was carried out. There are sometimes broad categories of design that you’ll have heard of, like a ‘survey design’, ‘a review paper’, or an ‘experimental design’. Within these categories, though, there can be more specific types of design (e.g. a  cross-sectional  survey design, or a  longitudinal  survey design; a  randomised controlled  experiment or a  simple pre-post  experiment). Knowing these specific types of design is a good place to start when thinking about how to critique the evidence when citing your sources, and the image below can help with that. 

Image source: https://thelogicofscience.com/2016/01/12/the-hierarchy-of-evidence-is-the-studys-design-robust/

In summary, there are various types of designs in psychology research. To name a few from the image above, we have: a meta-analysis or a systematic review (a review paper that summarises the research that explores the same research question); a cross-sectional survey study (a questionnaire that people complete once – these are really common in psychology!). If you’re not familiar with these, I would  highly suggest  doing a bit of reading around these methods and some of their general limitations – you can then use these limitation points in your assignments! To help with this, you could do a Google Scholar search for ‘limitations of a cross-sectional study’, or ‘why are randomised control trials gold standard?’. You can use any published papers as further support as a limitation.

Methodological critical evaluation

• Internal validity: Are the findings or the measures used in the study reliable (e.g., have they been replicated by another study, and is the reliability high)? 
• External validity: Are there any biases in the study that might affect generalisability(e.g., gender bias, where one gender may be overrepresented for the population in the sample recruited)?  Lack of generalisability is a common limitation that undergraduates tend to use by default as a limitation in their reports. It’s a perfectly valid limitation, but it can usually be made much more impactful by explaining exactly  how  it’s a problem for the topic of study. In some cases, this limitation may not be all that warranted; for example, a female bias may be expected in a sample of psychology students, because undergraduate courses tend to be filled mostly with females! 
• What is the design of the study, and how it a good or bad quality design (randomised control trial, cross-sectional study)? 

Theoretical critical evaluation

• Do the findings in the literature support the relevant psychological theories?
• Have the findings been replicated in another study? (If so, say so and add a reference!)

Practical critical evaluation

• In the real world, how easy would it be to implement these findings?
• Have these findings been implemented? (If so, you could find out if this has been done well!)

Summary points

In summary, there are various types of designs in psychology research. To name a few from the image above, we have: a meta-analysis or a systematic review (a review paper that summarises the research that explores the same research question); a cross-sectional survey study (a questionnaire that people complete once – these are really common in psychology!). If you’re not familiar with these, I would highly suggest doing a bit of reading around these methods and some of their general limitations – you can then use these limitation points in your assignments! To help with this, I would do a Google Scholar search for ‘limitations of a cross-sectional study’, or ‘why are randomised control trials gold standard?’. You can use these papers as further support as a limitation.

You don’t have to use all of these points in your writing, these are just examples of how you can demonstrate critical thinking in your work. Try to use at least a couple in any assignment. Here is an example of how to write these up:

An example write-up

“Depression and anxiety are generally associated with each other (see the meta-analysis by [reference here]). For example, one of these studies was a cross-sectional study [reference here] with 500 undergraduate psychology students. The researchers found that depression and anxiety (measured using the DASS-21 measure) were correlated at  r  = .76, indicating a strong effect. However, this one study is limited in that it used a cross-sectional design, which do not tell us whether depression causes anxiety or whether anxiety causes depression; it just tells us that they are correlated. It’s also limited in that the participants are not a clinical sample, which does not tell us about whether these are clinically co-morbid constructs. Finally, a strength of this study is that it used the DASS-21 which is generally found to be a reliable measure. Future studies would therefore benefit from using a longitudinal design to gain an idea as to how these variables are causally related to one another, and use more clinical samples to understand the implications for clinical practice. Overall, however, the research generally suggests that depression and anxiety are associated. That there is a meta-analysis on this topic [reference here], showing that there is lots of evidence, suggests that this finding is generally well-accepted.”

• Notice how I first found a review paper on the topic to broadly tell the reader how much evidence there is in the first place. I set the scene of the paragraph with the first sentence, and then the last sentence I brought it back, rounding the paragraph off. 
• Notice how I then described one study from this paper in more detail. Specifically, I mentioned the participants, the design of the study and the measure the researchers used to assess these variables. Critically, I then described  how  each of these pieces of the method are disadvantages/strengths of the study. Sometimes, it’s enough to just say “the study was limited in that it was a cross-sectional study”, but it can really show that you are thinking critically, if you also add “… because it does not tell us….”. 
• Notice how I added a statistic there to further illustrate my point (in this case, it was the correlation coefficient), showing that I didn’t just read the abstract of the paper. Doing this for the effect sizes in a study can also help demonstrate to a reader that you understand statistics (a higher-level marking criteria). 

Are these points you can include in your own work?

Thanks for reading,

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What Is Random Selection?

Categories Dictionary

Random selection refers to a process that researchers use to pick participants for a study. When using this method, every single member of a population has an equal chance of being chosen as a subject.

This process is an important research tool used in psychology research, allowing scientists to create representative samples from which conclusions can be drawn and applied to the larger population.

Table of Contents

Examples of Random Selection

Random selection is a crucial technique in psychology research to ensure that samples are representative of the population, thus enhancing the generalizability of the findings. Here are a few brief examples of how random selection can be used in different areas of psychology research:

Survey Research on Mental Health

A researcher wants to study the prevalence of anxiety disorders among adults in a city. They use random selection to choose a sample of adults from the city’s population registry. This ensures that every adult in the city has an equal chance of being selected, making the sample representative of the entire adult population.

Experimental Research on Cognitive Processes:

To investigate the effects of sleep deprivation on memory, a researcher randomly selects participants from a university’s student population. By randomly assigning these students to either a sleep-deprived group or a control group, the researcher ensures that any differences in memory performance are likely due to the manipulation of sleep rather than pre-existing differences between groups.

Developmental Psychology Studies

A study aims to understand the development of language skills in toddlers. The researcher randomly selects toddlers from several daycare centers in a region. This random selection helps ensure that the sample includes children from diverse backgrounds, leading to more generalizable findings about language development.

Clinical Trials for Psychological Interventions

In testing a new therapeutic intervention for depression, a researcher randomly selects participants from a pool of individuals diagnosed with depression. Participants are then randomly assigned to either the intervention group or a control group (e.g., receiving standard care). This random selection and assignment help control for potential confounding variables and biases.

Social Psychology Research

To study the impact of group dynamics on decision-making, a researcher randomly selects employees from different departments of a large corporation. By using random selection, the researcher can ensure that the sample is not biased towards any particular department, making the findings more applicable across the entire corporation.

These examples illustrate how random selection helps create representative samples and enhances the internal and external validity of psychological research.

Random Selection vs. Random Assignment

It is important to note that random selection is not the same as random assignment . While random selection involves how participants are chosen for a study, random assignment involves how those chosen are then assigned to different groups in the experiment.

Many studies and experiments actually use both random selection and random assignment.

For example, random selection might be used to draw 100 students to participate in a study. Each of these 100 participants would then be randomly assigned to either the control group or the experimental group.

Reasons to Use Random Selection

What is the reason that researchers choose to use random selection when conducting research?

Some key reasons include:

Increased Generalizability

Random selection is one way to help improve the generalizability of the results. A sample is drawn from a larger population. Researchers want to be sure that the sample they use in their study accurately reflects the characteristics of the larger group.

The more representative the sample is, the better able the researchers can generalize the results of their experiment to a larger population.

By randomly selecting participants for a study, researchers can also help minimize the possibility of bias influencing the results.

Reduced Outlier Effects

Random selection helps ensure that anomalies will not skew results. By randomly selecting participants for a study, researchers are less likely to draw on subjects that may share unusual characteristics in common.

For example, suppose researchers were interested in learning how many people in the general population are left-handed. In that case, the results might be skewed if subjects were inadvertently drawn from a group that included an unusually high number of left-handed individuals.

Random selection ensures that the group better represents what exists in the real world.

Hilbert, S. (2017). Random selection . In: Zeigler-Hill, V., Shackelford, T. (eds) Encyclopedia of Personality and Individual Differences . Springer, Cham. https://doi.org/10.1007/978-3-319-28099-8_1344-1

Martínez-Mesa, J., González-Chica, D. A., Duquia, R. P., Bonamigo, R. R., & Bastos, J. L. (2016). Sampling: how to select participants in my research study ?  Anais brasileiros de dermatologia ,  91 (3), 326–330. https://doi.org/10.1590/abd1806-4841.20165254

Resources: Discussions and Assignments

Assignment: research in psychology, psychology in the news.

STEP 1 : Find a popular news article from within the past 10 years that reports on the results of a psychological study. This should not be a blog entry, but a published article from a news source such as Time Magazine , The New York Times , Newsweek , NPR , CNN , Fox News , etc. A great place to look is the APA’s Psychology news portal . Read through the article and ensure that it is descriptive and sufficiently long enough in order to draw conclusions from the original research mentioned.

STEP 2 : Go find the psychological study or studies that are mentioned in the news report. Sometimes those are not freely available online, so you may have to track down the original study through your library’s website. You can find these articles within reputable journals, such as the American Journal of Psychology , Cognitive Psychology , Emotion , Journal of Abnormal Psychology , Journal of Applied Psychology , Journal of Counseling Psychology , Journal of Educational Psychology , Journal of Personality and Social Psychology , and Memory . The study should have been performed within the past 10 years.

STEP 3 : Write a paper between 250-500 words that:

• describes and summarizes both articles
• compares and contrasts the key points, style, and purpose of the news article with that of the research article
• examines if the news article accurately describes the research
• includes correct APA citations (both in-text and in a reference page) for both of the articles
• Finding Articles Assignment. Provided by : Lumen Learning. License : CC BY: Attribution

Theoretical Perspectives of Psychology (Psychological Approaches)

Saul Mcleod, PhD

Editor-in-Chief for Simply Psychology

BSc (Hons) Psychology, MRes, PhD, University of Manchester

Saul Mcleod, PhD., is a qualified psychology teacher with over 18 years of experience in further and higher education. He has been published in peer-reviewed journals, including the Journal of Clinical Psychology.

Learn about our Editorial Process

Olivia Guy-Evans, MSc

Associate Editor for Simply Psychology

BSc (Hons) Psychology, MSc Psychology of Education

Olivia Guy-Evans is a writer and associate editor for Simply Psychology. She has previously worked in healthcare and educational sectors.

On This Page:

There may be several theories within an approach, but they all share these assumptions.

The five major psychological perspectives are biological, psychodynamic, behavioral, cognitive, and humanistic, and provide different lenses through which phenomena are explained and analyzed.

You may wonder why there are so many different psychological approaches and whether one approach is correct and another wrong.

Most psychologists would agree that no one approach is correct, although in the past, in the early days of psychology, the behaviorist would have said their perspective was the only truly scientific one.

Each approach has its strengths and weaknesses, and brings something different to our understanding of human behavior.  For this reason, it is important that psychology does have different perspectives on the understanding and study of human and animal behavior.

Below is a summary of the six main psychological approaches (sometimes called perspectives) in psychology.

Behaviorist Perspective

If your layperson’s idea of psychology has always been about people in laboratories wearing white coats and watching hapless rats try to negotiate mazes in order to get to their dinner, then you are probably thinking about behavioral psychology.

Behaviorism is different from most other approaches because they view people (and animals) as controlled by their environment and specifically that we are the result of what we have learned from our environment.

The behaviorist perspective is concerned with how environmental factors (called stimuli) affect observable behavior (called the response).

The behaviorist perspective proposes two main processes whereby people learn from their environment: namely classical conditioning and operant conditioning. Classical conditioning involves learning by association, and operant conditioning involves learning from the consequences of behavior.

Classical conditioning (CC) was studied by the Russian psychologist Ivan Pavlov . Though looking into natural reflexes and neutral stimuli he managed to condition dogs to salivate to the sound of a bell through repeated associated with the sound of the bell and food.

The principles of CC have been applied in many therapies. These include systematic desensitization for phobias (step-by-step exposed to a feared stimulus at once) and aversion therapy.

B.F. Skinner investigated operant conditioning of voluntary and involuntary behavior. Skinner felt that some behavior could be explained by the person’s motive. Therefore behavior occurs for a reason, and the three main behavior shaping techniques are positive reinforcement, negative reinforcement, and punishment.

Behaviorism also believes in scientific methodology (e.g., controlled experiments), and that only observable behavior should be studied because this can be objectively measured. Behaviorism rejects the idea that people have free will, and believes that the environment determines all behavior.

Behaviorism is the scientific study of observable behavior working on the basis that behavior can be reduced to learned S-R (Stimulus-Response) units.

Behaviorism has been criticized in the way it under-estimates the complexity of human behavior. Many studies used animals which are hard to generalize to humans, and it cannot explain, for example, the speed in which we pick up language. There must be biological factors involved.

Psychodynamic Perspective

Who hasn’t heard of Sigmund Freud ? So many expressions of our daily life come from Freud’s theories of psychoanalysis – subconscious, denial, repression, and anal personality, to name only a few.

Freud believes that events in our childhood can have a significant impact on our behavior as adults. He also believed that people have little free will to make choices in life. Instead, our behavior is determined by the unconscious mind and childhood experiences.

Freud’s psychoanalysis is both a theory and therapy. It is the original psychodynamic theory and inspired psychologists such as Jung and Erikson to develop their own psychodynamic theories. Freud’s work is vast, and he has contributed greatly to psychology as a discipline.

Freud, the founder of psychoanalysis , explained the human mind as like an iceberg, with only a small amount of it being visible, that is our observable behavior, but it is the unconscious, submerged mind that has the most, underlying influence on our behavior.

Freud used three main methods of accessing the unconscious mind : free association, dream analysis and slips of the tongue .

He believed that the unconscious mind consisted of three components: the “ id” the “ego” and the “superego.”   The “id” contains two main instincts: “Eros”, which is the life instinct, which involves self-preservation and sex which is fuelled by the “libido” energy force. “Thanatos” is the death instinct, whose energies, because they are less powerful than those of “Eros” are channeled away from ourselves and into aggression towards others.

The “id” and the “superego” are constantly in conflict with each other, and the “ego” tries to resolve the discord. If this conflict is not resolved, we tend to use defense mechanisms to reduce our anxiety. Psychoanalysis attempts to help patients resolve their inner conflicts.

An aspect of psychoanalysis is Freud’s theory of psychosexual development . It shows how early experiences affect adult personality. Stimulation of different areas of the body is important as the child progresses through the important developmental stages. Too much or too little can have bad consequences later.

The most important stage is the phallic stage where the focus of the libido is on the genitals.  During this stage little boys experience the “ Oedipus complex “, and little girls experience the “ Electra complex .” These complexes result in children identifying with their same-sex parent, which enables them to learn sex-appropriate behavior and a moral code of conduct.

However, it has been criticized in the way that it over emphasizes the importance of sexuality and under emphasized the role of social relationships. The theory is not scientific, and can’t be proved as it is circular.

Nevertheless, psychoanalysis has been greatly contributory to psychology in that it has encouraged many modern theorists to modify it for the better, using its basic principles, but eliminating its major flaws.

Humanistic Perspective

Humanistic psychology is a psychological perspective that emphasizes the study of the whole person (know as holism).  Humanistic psychologists look at human behavior, not only through the eyes of the observer, but through the eyes of the person doing the behaving.

Humanistic psychologists believe that an individual’s behavior is connected to his inner feelings and self-image . The humanistic perspective centers on the view that each person is unique and individual, and has the free will to change at any time in his or her life.

The humanistic perspective suggests that we are each responsible for our own happiness and well-being as humans. We have the innate (i.e., inborn) capacity for self-actualization, which is our unique desire to achieve our highest potential as people.

Because of this focus on the person and his or her personal experiences and subjective perception of the world the humanists regarded scientific methods as inappropriate for studying behavior.

Two of the most influential and enduring theories in humanistic psychology that emerged in the 1950s and 1960s are those of Carl Rogers and Abraham Maslow .

Cognitive Perspective

Psychology was institutionalized as a science in 1879 by Wilhelm Wundt , who found the first psychological laboratory.

His initiative was soon followed by other European and American Universities. These early laboratories, through experiments, explored areas such as memory and sensory perception, both of which Wundt believed to be closely related to physiological processes in the brain.

The whole movement had evolved from the early philosophers, such as Aristotle and Plato. Today this approach is known as cognitive psychology .

Cognitive Psychology revolves around the notion that if we want to know what makes people tick then the way to do it is to figure out what processes are actually going on in their minds. In other words, psychologists from this perspective study cognition which is ‘the mental act or process by which knowledge is acquired.’

The cognitive perspective is concerned with “mental” functions such as memory , perception , attention , etc. It views people as being similar to computers in the way we process information (e.g., input-process-output). For example, both human brains and computers process information, store data and have input an output procedure.

This had led cognitive psychologists to explain that memory comprises of three stages: encoding (where information is received and attended to), storage (where the information is retained) and retrieval (where the information is recalled).

It is an extremely scientific approach and typically uses lab experiments to study human behavior. The cognitive approach has many applications including cognitive therapy and eyewitness testimony .

Biological Perspective In Psychology

The biological perspective states that all thoughts, feeling & behavior ultimately have a biological cause. It is one of the major perspectives in psychology and involves such things as studying the brain, genetics, hormones, and the immune and nervous systems.

Theorists in the biological perspective who study behavioral genomics consider how genes affect behavior. Now that the human genome is mapped, perhaps, we will someday understand more precisely how behavior is affected by the DNA we inherit.

Biological factors such as chromosomes, hormones and the brain all have a significant influence on human behavior, for example, gender .

The biological approach believes that most behavior is inherited and has an adaptive (or evolutionary) function. For example, in the weeks immediately after the birth of a child, levels of testosterone in fathers drop by more than 30 percent.

This has an evolutionary function. Testosterone-deprived men are less likely to wander off in search of new mates to inseminate. They are also less aggressive, which is useful when there is a baby around.

Biological psychologists explain behaviors in neurological terms, i.e., the physiology and structure of the brain and how this influences behavior.

Many biological psychologists have concentrated on abnormal behavior and have tried to explain it.  For example, biological psychologists believe that schizophrenia is affected by levels of dopamine (a neurotransmitter).

These findings have helped psychiatry take off and help relieve the symptoms of mental illness through drugs. However, Freud and other disciplines would argue that this just treats the symptoms and not the cause.

This is where health psychologists take the finding that biological psychologists produce and look at the environmental factors that are involved to get a better picture.

Evolutionary Psychology

A central claim of evolutionary psychology is that the brain (and therefore the mind) evolved to solve problems encountered by our hunter-gatherer ancestors during the upper Pleistocene period over 10,000 years ago.

The Evolutionary approach explains behavior in terms of the selective pressures that shape behavior. Most behaviors that we see/display are believed to have developed during our EEA (environment of evolutionary adaptation) to help us survive.

Observed behavior is likely to have developed because it is adaptive. It has been naturally selected, i.e., individuals who are best adapted to survive and reproduce. behaviors may even be sexually selected, i.e., individuals who are most successful in gaining access to mates leave behind more offspring.

The mind is therefore equipped with ‘instincts’ that enabled our ancestors to survive and reproduce.

A strength of this approach is that it can explain behaviors that appear dysfunctional, such as anorexia, or behaviors that make little sense in a modern context, such as our biological stress response when finding out we are overdrawn at the bank.

Perspectives Conclusion

Therefore, in conclusion, there are so many different perspectives in psychology to explain the different types of behavior and give different angles.  No one perspective has explanatory powers over the rest.

Only with all the different types of psychology, which sometimes contradict one another (nature-nurture debate), overlap with each other (e.g. psychoanalysis and child psychology) or build upon one another (biological and health psychologist) can we understand and create effective solutions when problems arise, so we have a healthy body and a healthy mind.

The fact that there are different perspectives represents the complexity and richness of human (and animal) behavior. A scientific approach, such as Behaviorism or cognitive psychology, tends to ignore the subjective (i.e., personal) experiences that people have.

The humanistic perspective does recognize human experience, but largely at the expense of being non-scientific in its methods and ability to provide evidence.  The psychodynamic perspective concentrates too much on the unconscious mind and childhood. As such, it tends to lose sight of the role of socialization (which is different in each country) and the possibility of free will.

The biological perspective reduces humans to a set of mechanisms and physical structures that are clearly essential and important (e.g., genes).  However, it fails to account for consciousness and the influence of the environment on behavior.

What is the difference between a psychological perspective and a field in psychology?

Psychology approaches refer to theoretical perspectives or frameworks used to understand, explain, and predict human behavior, such as behaviorism, cognitive, or psychoanalytic approaches.

Branches of psychology are specialized fields or areas of study within psychology, like clinical psychology, developmental psychology, or school psychology.

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What Is a Case Study?

Weighing the pros and cons of this method of research

Kendra Cherry, MS, is a psychosocial rehabilitation specialist, psychology educator, and author of the "Everything Psychology Book."

Cara Lustik is a fact-checker and copywriter.

Verywell / Colleen Tighe

• Pros and Cons

What Types of Case Studies Are Out There?

Where do you find data for a case study, how do i write a psychology case study.

A case study is an in-depth study of one person, group, or event. In a case study, nearly every aspect of the subject's life and history is analyzed to seek patterns and causes of behavior. Case studies can be used in many different fields, including psychology, medicine, education, anthropology, political science, and social work.

The point of a case study is to learn as much as possible about an individual or group so that the information can be generalized to many others. Unfortunately, case studies tend to be highly subjective, and it is sometimes difficult to generalize results to a larger population.

While case studies focus on a single individual or group, they follow a format similar to other types of psychology writing. If you are writing a case study, we got you—here are some rules of APA format to reference.  

At a Glance

A case study, or an in-depth study of a person, group, or event, can be a useful research tool when used wisely. In many cases, case studies are best used in situations where it would be difficult or impossible for you to conduct an experiment. They are helpful for looking at unique situations and allow researchers to gather a lot of˜ information about a specific individual or group of people. However, it's important to be cautious of any bias we draw from them as they are highly subjective.

What Are the Benefits and Limitations of Case Studies?

A case study can have its strengths and weaknesses. Researchers must consider these pros and cons before deciding if this type of study is appropriate for their needs.

One of the greatest advantages of a case study is that it allows researchers to investigate things that are often difficult or impossible to replicate in a lab. Some other benefits of a case study:

• Allows researchers to capture information on the 'how,' 'what,' and 'why,' of something that's implemented
• Gives researchers the chance to collect information on why one strategy might be chosen over another
• Permits researchers to develop hypotheses that can be explored in experimental research

On the other hand, a case study can have some drawbacks:

• It cannot necessarily be generalized to the larger population
• Cannot demonstrate cause and effect
• It may not be scientifically rigorous
• It can lead to bias

Researchers may choose to perform a case study if they want to explore a unique or recently discovered phenomenon. Through their insights, researchers develop additional ideas and study questions that might be explored in future studies.

It's important to remember that the insights from case studies cannot be used to determine cause-and-effect relationships between variables. However, case studies may be used to develop hypotheses that can then be addressed in experimental research.

Case Study Examples

There have been a number of notable case studies in the history of psychology. Much of  Freud's work and theories were developed through individual case studies. Some great examples of case studies in psychology include:

• Anna O : Anna O. was a pseudonym of a woman named Bertha Pappenheim, a patient of a physician named Josef Breuer. While she was never a patient of Freud's, Freud and Breuer discussed her case extensively. The woman was experiencing symptoms of a condition that was then known as hysteria and found that talking about her problems helped relieve her symptoms. Her case played an important part in the development of talk therapy as an approach to mental health treatment.
• Phineas Gage : Phineas Gage was a railroad employee who experienced a terrible accident in which an explosion sent a metal rod through his skull, damaging important portions of his brain. Gage recovered from his accident but was left with serious changes in both personality and behavior.
• Genie : Genie was a young girl subjected to horrific abuse and isolation. The case study of Genie allowed researchers to study whether language learning was possible, even after missing critical periods for language development. Her case also served as an example of how scientific research may interfere with treatment and lead to further abuse of vulnerable individuals.

Such cases demonstrate how case research can be used to study things that researchers could not replicate in experimental settings. In Genie's case, her horrific abuse denied her the opportunity to learn a language at critical points in her development.

This is clearly not something researchers could ethically replicate, but conducting a case study on Genie allowed researchers to study phenomena that are otherwise impossible to reproduce.

There are a few different types of case studies that psychologists and other researchers might use:

• Collective case studies : These involve studying a group of individuals. Researchers might study a group of people in a certain setting or look at an entire community. For example, psychologists might explore how access to resources in a community has affected the collective mental well-being of those who live there.
• Descriptive case studies : These involve starting with a descriptive theory. The subjects are then observed, and the information gathered is compared to the pre-existing theory.
• Explanatory case studies : These   are often used to do causal investigations. In other words, researchers are interested in looking at factors that may have caused certain things to occur.
• Exploratory case studies : These are sometimes used as a prelude to further, more in-depth research. This allows researchers to gather more information before developing their research questions and hypotheses .
• Instrumental case studies : These occur when the individual or group allows researchers to understand more than what is initially obvious to observers.
• Intrinsic case studies : This type of case study is when the researcher has a personal interest in the case. Jean Piaget's observations of his own children are good examples of how an intrinsic case study can contribute to the development of a psychological theory.

The three main case study types often used are intrinsic, instrumental, and collective. Intrinsic case studies are useful for learning about unique cases. Instrumental case studies help look at an individual to learn more about a broader issue. A collective case study can be useful for looking at several cases simultaneously.

The type of case study that psychology researchers use depends on the unique characteristics of the situation and the case itself.

There are a number of different sources and methods that researchers can use to gather information about an individual or group. Six major sources that have been identified by researchers are:

• Archival records : Census records, survey records, and name lists are examples of archival records.
• Direct observation : This strategy involves observing the subject, often in a natural setting . While an individual observer is sometimes used, it is more common to utilize a group of observers.
• Documents : Letters, newspaper articles, administrative records, etc., are the types of documents often used as sources.
• Interviews : Interviews are one of the most important methods for gathering information in case studies. An interview can involve structured survey questions or more open-ended questions.
• Participant observation : When the researcher serves as a participant in events and observes the actions and outcomes, it is called participant observation.
• Physical artifacts : Tools, objects, instruments, and other artifacts are often observed during a direct observation of the subject.

If you have been directed to write a case study for a psychology course, be sure to check with your instructor for any specific guidelines you need to follow. If you are writing your case study for a professional publication, check with the publisher for their specific guidelines for submitting a case study.

Here is a general outline of what should be included in a case study.

Section 1: A Case History

This section will have the following structure and content:

Background information : The first section of your paper will present your client's background. Include factors such as age, gender, work, health status, family mental health history, family and social relationships, drug and alcohol history, life difficulties, goals, and coping skills and weaknesses.

Description of the presenting problem : In the next section of your case study, you will describe the problem or symptoms that the client presented with.

Describe any physical, emotional, or sensory symptoms reported by the client. Thoughts, feelings, and perceptions related to the symptoms should also be noted. Any screening or diagnostic assessments that are used should also be described in detail and all scores reported.

Your diagnosis : Provide your diagnosis and give the appropriate Diagnostic and Statistical Manual code. Explain how you reached your diagnosis, how the client's symptoms fit the diagnostic criteria for the disorder(s), or any possible difficulties in reaching a diagnosis.

Section 2: Treatment Plan

This portion of the paper will address the chosen treatment for the condition. This might also include the theoretical basis for the chosen treatment or any other evidence that might exist to support why this approach was chosen.

• Cognitive behavioral approach : Explain how a cognitive behavioral therapist would approach treatment. Offer background information on cognitive behavioral therapy and describe the treatment sessions, client response, and outcome of this type of treatment. Make note of any difficulties or successes encountered by your client during treatment.
• Humanistic approach : Describe a humanistic approach that could be used to treat your client, such as client-centered therapy . Provide information on the type of treatment you chose, the client's reaction to the treatment, and the end result of this approach. Explain why the treatment was successful or unsuccessful.
• Psychoanalytic approach : Describe how a psychoanalytic therapist would view the client's problem. Provide some background on the psychoanalytic approach and cite relevant references. Explain how psychoanalytic therapy would be used to treat the client, how the client would respond to therapy, and the effectiveness of this treatment approach.
• Pharmacological approach : If treatment primarily involves the use of medications, explain which medications were used and why. Provide background on the effectiveness of these medications and how monotherapy may compare with an approach that combines medications with therapy or other treatments.

This section of a case study should also include information about the treatment goals, process, and outcomes.

When you are writing a case study, you should also include a section where you discuss the case study itself, including the strengths and limitiations of the study. You should note how the findings of your case study might support previous research. 

In your discussion section, you should also describe some of the implications of your case study. What ideas or findings might require further exploration? How might researchers go about exploring some of these questions in additional studies?

Need More Tips?

Here are a few additional pointers to keep in mind when formatting your case study:

• Never refer to the subject of your case study as "the client." Instead, use their name or a pseudonym.
• Read examples of case studies to gain an idea about the style and format.
• Remember to use APA format when citing references .

Crowe S, Cresswell K, Robertson A, Huby G, Avery A, Sheikh A. The case study approach .  BMC Med Res Methodol . 2011;11:100.

Crowe S, Cresswell K, Robertson A, Huby G, Avery A, Sheikh A. The case study approach . BMC Med Res Methodol . 2011 Jun 27;11:100. doi:10.1186/1471-2288-11-100

Gagnon, Yves-Chantal.  The Case Study as Research Method: A Practical Handbook . Canada, Chicago Review Press Incorporated DBA Independent Pub Group, 2010.

Yin, Robert K. Case Study Research and Applications: Design and Methods . United States, SAGE Publications, 2017.

By Kendra Cherry, MSEd Kendra Cherry, MS, is a psychosocial rehabilitation specialist, psychology educator, and author of the "Everything Psychology Book."

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How to Work Together as a Team

Feeling like the other person has your back is key to feeling safe and close..

Posted May 24, 2024 | Reviewed by Monica Vilhauer

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• Teamwork requires giving up some control, not having to be right, and creating win-win compromises.

You undoubtedly have heard or read this many times: In a relationship, you need to work together as a team, as partners, as parents. But what does that mean? Here are some suggestions:

We've got each other’s back

This is the core of teamwork : Simply said, it’s “I want to help you be happy and live the life you want to live. And if you are struggling in any way, I want you to know that I am there to support and help you and am always reliable. And you will do the same for me.”

The problem is our joint focus

Teamwork recognizes that it’s you and me against the problem—navigating jobs or money, kids, parents, time pressures, emotional pressures, or financial pressures. Though we each have our own strengths and weaknesses, in the end, we work together equally to solve the problems that life throws at us.

We’re willing to negotiate and compromise

We won’t always agree about what’s important, the best strategy, or even about whose needs must come first. But because we have each other’s backs and want to focus on problems together, we can think outside the box, negotiate, and compromise. Compromise is not giving in, or forever diluting our goals and dreams , but looking for win-win agreements. We realize that if a person wants to have total control or always be right, they need to live alone.

Perhaps all is easier said than done, but usually what gets in the way of this teamwork is their opposites:

Everyone for themselves

You do you, I do me. I’m in charge of me; you’re in charge of you. The opposite of teamwork is existing in silos, parallel lives, each standing on their own two feet, no leaning allowed. Is there some connection? Sure—roommates with benefits, rallying around children or common work interests. But each person can feel lonely .

The other person is the problem

Instead of working together against a common problem, the problem (and sometimes the enemy) can become the other guy. In that case, there’s blame and accusations. The goal is no longer to tackle the problem together but to find out whose fault it is, get the other to admit it, and change to fix it. Power struggles and caustic arguments are a result.

One person is always in charge

When there is no negotiation or compromise, there’s an unbalanced relationship. One person is in charge, and the other accommodates. Or, one person is doing all the heavy lifting, and the other is slacking and passive. The accommodating person either periodically feels resentful over not having a voice and explodes, or eventually gets up and leaves. The heavy-lifting person gets tired of being the martyr and periodically explodes with resentment, collapses from burnout , or leaves.

Becoming a team

To overcome these obstacles to teamwork, change your attitude. The starting point is going to be with you. You need to change the old patterns and the emotional climate. It is time to step up and do what you haven’t been doing—control your temper, focus on solving problems rather than finding fault, pull back on the heavy lifting, be assertive , and be willing to compromise. Most importantly, see your partner as a partner, not someone above or below you. Lean into the notion that you are not alone and there is someone who can care and support you.

Be clear about what you need, and state your vision

You may need lifestyle changes—more free time, less responsibility. Or, you may need more safety and trust—to feel closer, to not have to walk on eggshells, and to have the connection you truly desire. Next, talk about your vision. How would you ideally like your relationship to look in the every day, over the longer haul, in terms of dreams and goals?

Realize you may lose some control

If you’ve been living a siloed life or have been in charge, transforming your partner into a teammate will mean losing some of the control you’ve been used to. While tackling problems together or compromising, you’ll have to make space for their ideas and priorities. It’s part of the cost of having a teammate. But it's worth it.

Allow for your individual styles

This is about matching strengths and weaknesses, not confusing means and ends. Experiment with letting go, trusting, and building on your partner’s strengths while advocating for yourself. Rather than falling into arguments about how to solve a problem, learn to focus first on the end, the goal you’re both trying to reach. Negotiate about the means as long as you both are clear about the goal.

They talk in sports about how teams made up of superstars with strong egos have to work hard to feel like and act like a team. It’s not easy if you grew up with different models, learned to distrust others, or managed life by having control. What may work in your larger life often doesn’t in intimate relationships; maintaining your ego is no longer the goal.

Ready to become a team?

Taibbi, R. (2017). Doing couple therapy, 2nd ed. New York: Guilford.

Bob Taibbi, L.C.S.W., has 49 years of clinical experience. He is the author of 13 books and over 300 articles and provides training nationally and internationally.

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