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How to Write an Introduction for a Psychology Paper

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

Emily is a board-certified science editor who has worked with top digital publishing brands like Voices for Biodiversity, Study.com, GoodTherapy, Vox, and Verywell.

• Writing Tips

If you are writing a psychology paper, it is essential to kick things off with a strong introduction. The introduction to a psychology research paper helps your readers understand why the topic is important and what they need to know before they delve deeper.

Your goal in this section is to introduce the topic to the reader, provide an overview of previous research on the topic, and identify your own hypothesis .

At a Glance

Writing a great introduction can be a great foundation for the rest of your psychology paper. To create a strong intro:

• Research your topic
• Outline your paper
• Introduce your topic
• Summarize the previous research
• Present your hypothesis or main argument

Before You Write an Introduction

There are some important steps you need to take before you even begin writing your introduction. To know what to write, you need to collect important background information and create a detailed plan.

Research Your Topic

Search a journal database, PsychInfo or ERIC, to find articles on your subject. Once you have located an article, look at the reference section to locate other studies cited in the article. As you take notes from these articles, be sure to write down where you found the information.

A simple note detailing the author's name, journal, and date of publication can help you keep track of sources and avoid plagiarism.

Create a Detailed Outline

This is often one of the most boring and onerous steps, so students tend to skip outlining and go straight to writing. Creating an outline might seem tedious, but it can be an enormous time-saver down the road and will make the writing process much easier.

Start by looking over the notes you made during the research process and consider how you want to present all of your ideas and research.

Introduce the Topic

Once you are ready to write your introduction, your first task is to provide a brief description of the research question. What is the experiment or study attempting to demonstrate? What phenomena are you studying? Provide a brief history of your topic and explain how it relates to your current research.

As you are introducing your topic, consider what makes it important. Why should it matter to your reader? The goal of your introduction is not only to let your reader know what your paper is about, but also to justify why it is important for them to learn more.

If your paper tackles a controversial subject and is focused on resolving the issue, it is important to summarize both sides of the controversy in a fair and impartial way. Consider how your paper fits in with the relevant research on the topic.

The introduction of a research paper is designed to grab interest. It should present a compelling look at the research that already exists and explain to readers what questions your own paper will address.

Summarize Previous Research

The second task of your introduction is to provide a well-rounded summary of previous research that is relevant to your topic. So, before you begin to write this summary, it is important to research your topic thoroughly.

Finding appropriate sources amid thousands of journal articles can be a daunting task, but there are several steps you can take to simplify your research. If you have completed the initial steps of researching and keeping detailed notes, writing your introduction will be much easier.

It is essential to give the reader a good overview of the historical context of the issue you are writing about, but do not feel like you must provide an exhaustive review of the subject. Focus on hitting the main points, and try to include the most relevant studies.

You might describe previous research findings and then explain how the current study differs or expands upon earlier research.

Provide Your Hypothesis

Once you have summarized the previous research, explain areas where the research is lacking or potentially flawed. What is missing from previous studies on your topic? What research questions have yet to be answered? Your hypothesis should lead to these questions.

At the end of your introduction, offer your hypothesis and describe what you expected to find in your experiment or study.

The introduction should be relatively brief. You want to give your readers an overview of a topic, explain why you are addressing it, and provide your arguments.

Tips for Writing Your Psychology Paper Intro

• Use 3x5 inch note cards to write down notes and sources.
• Look in professional psychology journals for examples of introductions.
• Remember to cite your sources.
• Maintain a working bibliography with all of the sources you might use in your final paper. This will make it much easier to prepare your reference section later on.
• Use a copy of the APA style manual to ensure that your introduction and references are in proper APA format .

What This Means For You

Before you delve into the main body of your paper, you need to give your readers some background and present your main argument in the introduction of you paper. You can do this by first explaining what your topic is about, summarizing past research, and then providing your thesis.

Armağan A. How to write an introduction section of a scientific article ?  Turk J Urol . 2013;39(Suppl 1):8-9. doi:10.5152/tud.2013.046

Fried T, Foltz C, Lendner M, Vaccaro AR. How to write an effective introduction .  Clin Spine Surg . 2019;32(3):111-112. doi:10.1097/BSD.0000000000000714

Jawaid SA, Jawaid M. How to write introduction and discussion .  Saudi J Anaesth . 2019;13(Suppl 1):S18-S19. doi:10.4103/sja.SJA_584_18

American Psychological Association. Information Recommended for Inclusion in Manuscripts That Report New Data Collections Regardless of Research Design . Published 2020.

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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Writing Research Papers

• Formatting Research Papers

Research papers written in APA style should follow the formatting rules specified in the Publication Manual of the American Psychological Association .  Most research papers that are written for psychology courses at UCSD, including the B.S. Degree Research Paper and the Honors Thesis, have to follow APA format.  Here we discuss the formatting of research papers according to APA style.

How to Format a Research Paper in APA Style

For the most accurate and comprehensive information on formatting papers in APA style, we recommend referring directly to the Publication Manual of the American Psychological Association. Reputable online sources (e.g., the official APA Style website and the Purdue University Online Writing Lab’s guide to APA style) are also recommended. 

According to the Publication Manual, the major sections and components of APA style research papers should adhere to the following guidelines.  Note that how closely these guidelines are followed may vary depending on the course and instructor.  

General Formatting Rules

• Papers should have at least 1-in. margins on all sides. 1
• All text should be double spaced . 1
• Times New Roman, 12 point font is preferred. 1
• All lines of text should be flush-left and should not be justified, except where noted in the Manual. 1
• The first line of every paragraph should be indented. Exceptions to the indenting rule are the Abstract, quotations, titles and headings, as well as Tables and Figures. 1
• Pages should be numbered at the top right, with the title page numbered page 1, the Abstract numbered page 2, and the text starting on page 3. 1
• An abbreviated title called the Running Head should be placed at the top of each page, flush-left in uppercase letters. 1
• Two spaces should be used after punctuation marks at the end of each sentence (in other words, there should be two spaces after the period that ends each sentence). 2

Formatting the Title Page

• The title should be typed in the upper half of the title page, centered, and with the first letters of all but minor words capitalized. 3
• The name(s) of the author(s) should be typed below the title and followed with the institutional affiliation(s) of the author(s). 3
• An Author Note should appear below the aforementioned items. The Author Note can have up to four paragraphs.  These respectively describe the author(s)’ departmental and institutional affiliation, any changes in affiliation, acknowledgments, and contact information. 3

Formatting the Abstract

• The Abstract typically should not exceed 250 words. 4
• The Abstract should be placed on a separate page, with the label Abstract appearing at the top center of that page and followed by the text of the Abstract. 4
• The Abstract should not be indented. 4

Formatting the Main Body of Text

• The main body of text should begin on a separate page after the Abstract. 5
• It should begin with the Introduction section. 5
• The Introduction section should be titled with the title of the research paper and not the word “Introduction.” The title should appear at the top of the page, centered, and should not be bolded. 5
• The remainder of the text should be flush-left, with each new paragraph indented except where noted above (see General Formatting Rules ). 5
• Each of the subsequent sections of the paper should be prefaced with a heading. APA guidelines specify different heading formats (for more information on Levels of Headings , see below). 5

Formatting References

• The references section should begin on a separate page after the main body of text. 6
• It should begin with the word “References” placed at the top of the page and centered. 6
• All references should be listed in alphabetical order by the last name of the first author of each reference. 6
• All references should be double-spaced and should use a hanging indent format wherein the first line of each reference is flush-left and all subsequent lines of that reference are indented (with that pattern repeating for each reference). 6
• All references should use the appropriate APA reference format (for more information, please see the Citing References section of this website). 6

Levels of Headings in APA Style

As of the sixth edition of the Publication Manual of the American Psychological Association (released in 2010), the five possible levels of heading in APA-formatted manuscripts are: 7

• Level 1: centered, bold, on a separate line, and the first letters of all but minor words capitalized.
• Level 2: flush-left, bold, on a separate line, and the first letters of all but minor words capitalized.
• Level 3: indented, bold, as a paragraph heading (the first part of a paragraph; regular text follows on the same line), and in lowercase letters ending with a period.
• Level 4: indented, bold, italicized, as a paragraph heading (the first part of a paragraph; regular text follows on the same line), and in lowercase letters ending with a period.
• Level 5: indented, not bold, italicized, as a paragraph heading (the first part of a paragraph; regular text follows on the same line), and in lowercase letters ending with a period.

Depending on the structure of your research paper, some or all of the five levels of headings may be used.  The headings have a “hierarchical nested structure” where Level 1 is the highest and Level 5 is the lowest.  For example, you may have a research paper which uses all five levels of heading as follows:

Downloadable Resources

• How to Write APA Style Research Papers (a comprehensive guide) [ PDF ]
• Tips for Writing APA Style Research Papers (a brief summary) [ PDF ]
• Example APA Style Research Paper (for B.S. Degree – empirical research) [ PDF ]
• Example APA Style Research Paper (for B.S. Degree – literature review) [ PDF ]

Further Resources

How-To Videos     

• Writing Research Paper Videos

External Resources

• APA Style Guide from the Purdue University Online Writing Lab (OWL)
• APA Tutorial on the Basics of APA Style
• EasyBib Guide to Writing and Citing in APA Format
• Sample APA Formatted Paper
• Sample APA Formatted Paper with Comments
• Tips for Writing a Paper in APA Style

1 VandenBos, G. R. (Ed). (2010). Publication manual of the American Psychological Association (6th ed.) (pp. 228-229).  Washington, DC: American Psychological Association.

2 vandenbos, g. r. (ed). (2010). (pp. 87-88). , 3 vandenbos, g. r. (ed). (2010). (pp. 23-25). , 4 vandenbos, g. r. (ed). (2010). (pp. 25-27)., 5 vandenbos, g. r. (ed). (2010). (pp. 41-49). , 6 vandenbos, g. r. (ed). (2010). (pp. 37-38, 49-51). , 7 vandenbos, g. r. (ed). (2010). (p. 62). .

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• Research Paper Structure
• Using Databases and Finding References
• What Types of References Are Appropriate?
• Evaluating References and Taking Notes
• Citing References
• Writing a Literature Review
• Writing Process and Revising
• Improving Scientific Writing
• Academic Integrity and Avoiding Plagiarism
• Writing Research Papers Videos

Case Study Research Method in Psychology

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:

Case studies are in-depth investigations of a person, group, event, or community. Typically, data is gathered from various sources using several methods (e.g., observations & interviews).

The case study research method originated in clinical medicine (the case history, i.e., the patient’s personal history). In psychology, case studies are often confined to the study of a particular individual.

The information is mainly biographical and relates to events in the individual’s past (i.e., retrospective), as well as to significant events that are currently occurring in his or her everyday life.

The case study is not a research method, but researchers select methods of data collection and analysis that will generate material suitable for case studies.

Freud (1909a, 1909b) conducted very detailed investigations into the private lives of his patients in an attempt to both understand and help them overcome their illnesses.

This makes it clear that the case study is a method that should only be used by a psychologist, therapist, or psychiatrist, i.e., someone with a professional qualification.

There is an ethical issue of competence. Only someone qualified to diagnose and treat a person can conduct a formal case study relating to atypical (i.e., abnormal) behavior or atypical development.

 Famous Case Studies

• Anna O – One of the most famous case studies, documenting psychoanalyst Josef Breuer’s treatment of “Anna O” (real name Bertha Pappenheim) for hysteria in the late 1800s using early psychoanalytic theory.
• Little Hans – A child psychoanalysis case study published by Sigmund Freud in 1909 analyzing his five-year-old patient Herbert Graf’s house phobia as related to the Oedipus complex.
• Bruce/Brenda – Gender identity case of the boy (Bruce) whose botched circumcision led psychologist John Money to advise gender reassignment and raise him as a girl (Brenda) in the 1960s.
• Genie Wiley – Linguistics/psychological development case of the victim of extreme isolation abuse who was studied in 1970s California for effects of early language deprivation on acquiring speech later in life.
• Phineas Gage – One of the most famous neuropsychology case studies analyzes personality changes in railroad worker Phineas Gage after an 1848 brain injury involving a tamping iron piercing his skull.

Clinical Case Studies

• Studying the effectiveness of psychotherapy approaches with an individual patient
• Assessing and treating mental illnesses like depression, anxiety disorders, PTSD
• Neuropsychological cases investigating brain injuries or disorders

Child Psychology Case Studies

• Studying psychological development from birth through adolescence
• Cases of learning disabilities, autism spectrum disorders, ADHD
• Effects of trauma, abuse, deprivation on development

Types of Case Studies

• Explanatory case studies : Used to explore causation in order to find underlying principles. Helpful for doing qualitative analysis to explain presumed causal links.
• Exploratory case studies : Used to explore situations where an intervention being evaluated has no clear set of outcomes. It helps define questions and hypotheses for future research.
• Descriptive case studies : Describe an intervention or phenomenon and the real-life context in which it occurred. It is helpful for illustrating certain topics within an evaluation.
• Multiple-case studies : Used to explore differences between cases and replicate findings across cases. Helpful for comparing and contrasting specific cases.
• Intrinsic : Used to gain a better understanding of a particular case. Helpful for capturing the complexity of a single case.
• Collective : Used to explore a general phenomenon using multiple case studies. Helpful for jointly studying a group of cases in order to inquire into the phenomenon.

Where Do You Find Data for a Case Study?

There are several places to find data for a case study. The key is to gather data from multiple sources to get a complete picture of the case and corroborate facts or findings through triangulation of evidence. Most of this information is likely qualitative (i.e., verbal description rather than measurement), but the psychologist might also collect numerical data.

1. Primary sources

• Interviews – Interviewing key people related to the case to get their perspectives and insights. The interview is an extremely effective procedure for obtaining information about an individual, and it may be used to collect comments from the person’s friends, parents, employer, workmates, and others who have a good knowledge of the person, as well as to obtain facts from the person him or herself.
• Observations – Observing behaviors, interactions, processes, etc., related to the case as they unfold in real-time.
• Documents & Records – Reviewing private documents, diaries, public records, correspondence, meeting minutes, etc., relevant to the case.

2. Secondary sources

• News/Media – News coverage of events related to the case study.
• Academic articles – Journal articles, dissertations etc. that discuss the case.
• Government reports – Official data and records related to the case context.
• Books/films – Books, documentaries or films discussing the case.

3. Archival records

Searching historical archives, museum collections and databases to find relevant documents, visual/audio records related to the case history and context.

Public archives like newspapers, organizational records, photographic collections could all include potentially relevant pieces of information to shed light on attitudes, cultural perspectives, common practices and historical contexts related to psychology.

4. Organizational records

Organizational records offer the advantage of often having large datasets collected over time that can reveal or confirm psychological insights.

Of course, privacy and ethical concerns regarding confidential data must be navigated carefully.

However, with proper protocols, organizational records can provide invaluable context and empirical depth to qualitative case studies exploring the intersection of psychology and organizations.

• Organizational/industrial psychology research : Organizational records like employee surveys, turnover/retention data, policies, incident reports etc. may provide insight into topics like job satisfaction, workplace culture and dynamics, leadership issues, employee behaviors etc.
• Clinical psychology : Therapists/hospitals may grant access to anonymized medical records to study aspects like assessments, diagnoses, treatment plans etc. This could shed light on clinical practices.
• School psychology : Studies could utilize anonymized student records like test scores, grades, disciplinary issues, and counseling referrals to study child development, learning barriers, effectiveness of support programs, and more.

How do I Write a Case Study in Psychology?

Follow specified case study guidelines provided by a journal or your psychology tutor. General components of clinical case studies include: background, symptoms, assessments, diagnosis, treatment, and outcomes. Interpreting the information means the researcher decides what to include or leave out. A good case study should always clarify which information is the factual description and which is an inference or the researcher’s opinion.

1. Introduction

• Provide background on the case context and why it is of interest, presenting background information like demographics, relevant history, and presenting problem.
• Compare briefly to similar published cases if applicable. Clearly state the focus/importance of the case.

2. Case Presentation

• Describe the presenting problem in detail, including symptoms, duration,and impact on daily life.
• Include client demographics like age and gender, information about social relationships, and mental health history.
• Describe all physical, emotional, and/or sensory symptoms reported by the client.
• Use patient quotes to describe the initial complaint verbatim. Follow with full-sentence summaries of relevant history details gathered, including key components that led to a working diagnosis.
• Summarize clinical exam results, namely orthopedic/neurological tests, imaging, lab tests, etc. Note actual results rather than subjective conclusions. Provide images if clearly reproducible/anonymized.
• Clearly state the working diagnosis or clinical impression before transitioning to management.

3. Management and Outcome

• Indicate the total duration of care and number of treatments given over what timeframe. Use specific names/descriptions for any therapies/interventions applied.
• Present the results of the intervention,including any quantitative or qualitative data collected.
• For outcomes, utilize visual analog scales for pain, medication usage logs, etc., if possible. Include patient self-reports of improvement/worsening of symptoms. Note the reason for discharge/end of care.

4. Discussion

• Analyze the case, exploring contributing factors, limitations of the study, and connections to existing research.
• Analyze the effectiveness of the intervention,considering factors like participant adherence, limitations of the study, and potential alternative explanations for the results.
• Identify any questions raised in the case analysis and relate insights to established theories and current research if applicable. Avoid definitive claims about physiological explanations.
• Offer clinical implications, and suggest future research directions.

5. Additional Items

• Thank specific assistants for writing support only. No patient acknowledgments.
• References should directly support any key claims or quotes included.
• Use tables/figures/images only if substantially informative. Include permissions and legends/explanatory notes.
• Provides detailed (rich qualitative) information.
• Provides insight for further research.
• Permitting investigation of otherwise impractical (or unethical) situations.

Case studies allow a researcher to investigate a topic in far more detail than might be possible if they were trying to deal with a large number of research participants (nomothetic approach) with the aim of ‘averaging’.

Because of their in-depth, multi-sided approach, case studies often shed light on aspects of human thinking and behavior that would be unethical or impractical to study in other ways.

Research that only looks into the measurable aspects of human behavior is not likely to give us insights into the subjective dimension of experience, which is important to psychoanalytic and humanistic psychologists.

Case studies are often used in exploratory research. They can help us generate new ideas (that might be tested by other methods). They are an important way of illustrating theories and can help show how different aspects of a person’s life are related to each other.

The method is, therefore, important for psychologists who adopt a holistic point of view (i.e., humanistic psychologists ).

Limitations

• Lacking scientific rigor and providing little basis for generalization of results to the wider population.
• Researchers’ own subjective feelings may influence the case study (researcher bias).
• Difficult to replicate.
• Time-consuming and expensive.
• The volume of data, together with the time restrictions in place, impacted the depth of analysis that was possible within the available resources.

Because a case study deals with only one person/event/group, we can never be sure if the case study investigated is representative of the wider body of “similar” instances. This means the conclusions drawn from a particular case may not be transferable to other settings.

Because case studies are based on the analysis of qualitative (i.e., descriptive) data , a lot depends on the psychologist’s interpretation of the information she has acquired.

This means that there is a lot of scope for Anna O , and it could be that the subjective opinions of the psychologist intrude in the assessment of what the data means.

For example, Freud has been criticized for producing case studies in which the information was sometimes distorted to fit particular behavioral theories (e.g., Little Hans ).

This is also true of Money’s interpretation of the Bruce/Brenda case study (Diamond, 1997) when he ignored evidence that went against his theory.

Breuer, J., & Freud, S. (1895).  Studies on hysteria . Standard Edition 2: London.

Curtiss, S. (1981). Genie: The case of a modern wild child .

Diamond, M., & Sigmundson, K. (1997). Sex Reassignment at Birth: Long-term Review and Clinical Implications. Archives of Pediatrics & Adolescent Medicine , 151(3), 298-304

Freud, S. (1909a). Analysis of a phobia of a five year old boy. In The Pelican Freud Library (1977), Vol 8, Case Histories 1, pages 169-306

Freud, S. (1909b). Bemerkungen über einen Fall von Zwangsneurose (Der “Rattenmann”). Jb. psychoanal. psychopathol. Forsch ., I, p. 357-421; GW, VII, p. 379-463; Notes upon a case of obsessional neurosis, SE , 10: 151-318.

Harlow J. M. (1848). Passage of an iron rod through the head.  Boston Medical and Surgical Journal, 39 , 389–393.

Harlow, J. M. (1868).  Recovery from the Passage of an Iron Bar through the Head .  Publications of the Massachusetts Medical Society. 2  (3), 327-347.

Money, J., & Ehrhardt, A. A. (1972).  Man & Woman, Boy & Girl : The Differentiation and Dimorphism of Gender Identity from Conception to Maturity. Baltimore, Maryland: Johns Hopkins University Press.

Money, J., & Tucker, P. (1975). Sexual signatures: On being a man or a woman.

Further Information

• Case Study Approach
• Case Study Method
• Enhancing the Quality of Case Studies in Health Services Research
• “We do things together” A case study of “couplehood” in dementia
• Using mixed methods for evaluating an integrative approach to cancer care: a case study

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Remove a code repository from this paper, mark the official implementation from paper authors, add a new evaluation result row, remove a task, add a method, remove a method, edit datasets, machine psychology: integrating operant conditioning with the non-axiomatic reasoning system for advancing artificial general intelligence research.

29 May 2024  ·  Robert Johansson · Edit social preview

This paper introduces an interdisciplinary framework called Machine Psychology, which merges principles from operant learning psychology with a specific Artificial Intelligence model, the Non-Axiomatic Reasoning System (NARS), to enhance Artificial General Intelligence (AGI) research. The core premise of this framework is that adaptation is crucial to both biological and artificial intelligence and can be understood through operant conditioning principles. The study assesses this approach via three operant learning tasks using OpenNARS for Applications (ONA): simple discrimination, changing contingencies, and conditional discrimination tasks. In the simple discrimination task, NARS demonstrated rapid learning, achieving perfect accuracy during both training and testing phases. The changing contingencies task showcased NARS's adaptability, as it successfully adjusted its behavior when task conditions were reversed. In the conditional discrimination task, NARS handled complex learning scenarios effectively, achieving high accuracy by forming and utilizing intricate hypotheses based on conditional cues. These findings support the application of operant conditioning as a framework for creating adaptive AGI systems. NARS's ability to operate under conditions of insufficient knowledge and resources, coupled with its sensorimotor reasoning capabilities, establishes it as a robust model for AGI. The Machine Psychology framework, by incorporating elements of natural intelligence such as continuous learning and goal-driven behavior, offers a scalable and flexible approach for real-world applications. Future research should investigate using enhanced NARS systems, more advanced tasks, and applying this framework to diverse, complex challenges to further progress the development of human-level AI.

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Harry Harlow’s Transformative Research: Beyond the Bounds of Psychology

This essay is about Harry Harlow’s groundbreaking experiments with rhesus monkeys that transformed our understanding of maternal care and social relationships. It highlights Harlow’s discovery that emotional connection, rather than nourishment, is crucial for secure attachment bonds. The essay discusses the severe psychological effects of maternal deprivation and social isolation observed in Harlow’s studies, paralleling human attachment disorders. It also explores the neurobiological insights gained from Harlow’s research, which revealed changes in brain structure due to social neglect. Additionally, the essay addresses the ethical debates sparked by Harlow’s work, which led to reforms in animal welfare and influenced fields like education, mental health, and social policy.

How it works

Harry Harlow, an unconventional pioneer in psychology, embarked on a series of transformative experiments with rhesus monkeys, unraveling the intricate threads of maternal care and social relationships. His groundbreaking studies profoundly shifted our understanding of primate development, upending traditional beliefs and igniting a new era in psychological research.

Central to Harlow’s investigation was the examination of maternal attachment and its critical impact on infant development. Contrary to the dominant theories of his time, which prioritized nourishment as the key component in maternal-infant bonding, Harlow’s innovative experiments unveiled a deeper truth: the vital importance of emotional connection and maternal warmth.

By employing surrogate mothers—one fashioned from soft cloth for comfort and another from wire for nourishment—Harlow demonstrated that infant monkeys overwhelmingly chose the comforting cloth surrogate. This finding underscored the profound significance of emotional comfort in fostering secure attachment bonds, challenging prevailing wisdom and reshaping our understanding of developmental psychology.

Harlow’s research also cast a stark light on the long-term effects of maternal deprivation and social isolation. By subjecting infant monkeys to varying degrees of early adversity, including prolonged separation from their mothers and isolation from peers, Harlow illustrated the severe and lasting consequences of social neglect on psychological well-being. Monkeys reared in isolation exhibited a range of behavioral abnormalities, including heightened anxiety, social withdrawal, and self-injurious behavior. These findings mirrored symptoms of human attachment disorders, highlighting the critical role of social experiences in shaping developmental outcomes and underscoring the parallels between human and primate psychology.

Furthermore, Harlow’s pioneering work delved into the neurobiological mechanisms underlying attachment and social behavior. Through meticulous neuroanatomical and neurochemical analyses, Harlow uncovered significant alterations in the brain structure and neurotransmitter systems of socially deprived monkeys. These discoveries offered unprecedented insights into the neural basis of attachment-related behaviors, advancing our understanding of primate psychology and laying the groundwork for future research into the interplay between early experiences, brain development, and behavioral outcomes.

Beyond its scientific contributions, Harlow’s work ignited ethical debates and spurred reforms in animal welfare practices. The ethical implications of subjecting monkeys to varying degrees of psychological distress prompted profound questions about the treatment of animals in research settings and the moral responsibilities of scientists. While Harlow’s experiments yielded invaluable knowledge, they also underscored the ethical imperative of conducting research with compassion and respect for the welfare of research subjects. This ethical awakening catalyzed the development of guidelines and regulations aimed at safeguarding the well-being of laboratory animals, reflecting a broader societal shift towards more humane research practices.

Harlow’s legacy extends far beyond the confines of psychology, influencing a wide range of fields and sparking interdisciplinary dialogues. His work on maternal attachment and social behavior has had profound implications for education, social policy, and mental health, informing interventions and practices aimed at fostering healthy development and well-being. Educators and policymakers have drawn on Harlow’s findings to advocate for the importance of nurturing and emotionally supportive environments, recognizing the critical role of early relationships in shaping long-term outcomes.

In the realm of mental health, Harlow’s research has informed therapeutic approaches and interventions for individuals with attachment disorders and related conditions. Clinicians have utilized insights from Harlow’s studies to develop strategies for promoting secure attachments and addressing the psychological effects of early adversity. This cross-disciplinary impact underscores the enduring relevance of Harlow’s work, as it continues to inform and inspire efforts to enhance human well-being and development.

Harlow’s contributions have also sparked a broader cultural reflection on the nature of human relationships and the importance of emotional connections. His findings have resonated with a wide audience, challenging societal norms and prompting a reevaluation of the ways in which we nurture and support one another. This cultural shift is evident in the growing recognition of the importance of mental health and emotional well-being, as well as in the increasing emphasis on compassionate and empathetic approaches to caregiving and support.

In conclusion, Harry Harlow’s pioneering experiments with rhesus monkeys have left an indelible mark on the fields of psychology and animal behavior, offering profound insights into the importance of maternal care and social relationships in primate development. By challenging prevailing theories, unraveling the neurobiological underpinnings of attachment, and sparking ethical debates, Harlow’s research continues to shape our understanding of human and animal behavior, leaving a lasting legacy that transcends disciplinary boundaries. His work serves as a testament to the power of scientific inquiry to transform our understanding of the world and inspire positive change, reflecting the enduring impact of his contributions on both the scientific community and society at large.

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Does residential photovoltaic installation matter for coal-to-electricity transition? Evidence from self-determination theory perspective

• Published: 03 June 2024

Cite this article

• Shali Wang 1 ,
• Ying Wang 2 ,
• Shuangshuang Fan 3 ,
• Muhammad Shahbaz 4 , 5 ,
• Xiaodong Guo 6 &
• Ruoxue Yu 1  

The Chinese government is steadfast in its pursuit of dual carbon goals, advocating for the expansion of residential photovoltaic power generation as a means to revolutionize rural energy consumption. Despite the importance of this transition, the current literature lacks a thorough analysis of its implications. This research employs Self-Determination Theory to analyze 1,136 surveys, examining the role of residential photovoltaic adoption in facilitating the shift from coal to electricity. Through PLS-SEM modeling, the study reveals that photovoltaic technology adoption significantly enhances residents’ energy autonomy (β = 0.331), perceptual competence (β = 0.311), and ownership consciousness (β = 0.323), which in turn mediate their willingness to embrace electricity as the main energy source (β = 0.135). Current policies that blend economic incentives with environmental education have successfully increased the uptake of residential photovoltaic systems and residents’ propensity for electrical energy, with economic incentives (β = 0.021) proving more influential than environmental campaigns (β = 0.009). This underscores the pivotal role of economic factors in driving energy consumption behavior. Consequently, the paper proposes policy recommendations centered on photovoltaic subsidies, environmental awareness, and the integration of residential photovoltaic systems with coal-to-electricity strategies to enhance the effectiveness of these interventions and promote a sustainable energy future.

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This study has been supported by the Youth Foundation of Social Science and Humanity, China Ministry of Education (20YJC630031) and the Regional First-class Discipline of Ecology in Guizhou Province (XKTJ [2020]22).

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Wang, S., Wang, Y., Fan, S. et al. Does residential photovoltaic installation matter for coal-to-electricity transition? Evidence from self-determination theory perspective. Curr Psychol (2024). https://doi.org/10.1007/s12144-024-06152-9

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• 28 May 2024

Heed lessons from past studies involving transgender people: first, do no harm

• Mathilde Kennis 0 ,
• Robin Staicu 1 ,
• Marieke Dewitte 2 ,
• Guy T’Sjoen 3 ,
• Alexander T. Sack 4 &
• Felix Duecker 5

Mathilde Kennis is a researcher in cognitive neuroscience and clinical psychological science at Maastricht University, the Netherlands.

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Robin Staicu is a neuroscientist and specialist in diversity, equity and inclusion at Maastricht University, the Netherlands.

Marieke Dewitte is a sexologist and assistant professor in clinical psychological science at Maastricht University, the Netherlands.

Guy T’Sjoen is a clinical endocrinologist and professor in endocrinology at Ghent University Hospital, Belgium, the medical coordinator of the Centre for Sexology and Gender at Ghent University Hospital, and one of the founders of the European Professional Association for Transgender Health.

Alexander T. Sack is a professor in cognitive neuroscience at Maastricht University, the Netherlands.

Felix Duecker is an assistant professor in cognitive neuroscience at Maastricht University, the Netherlands.

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Over the past few decades, neuroscientists, endocrinologists, geneticists and social scientists have conducted numerous studies involving transgender people, meaning those whose gender identity does not conform to that typically associated with the sex to which they were assigned at birth. Justifications for doing such research have shifted over the years and, today, investigators are increasingly focused on assessments of transgender people’s mental health or the impact of hormone therapies.

But such work raises challenges. Despite researchers’ best intentions, these studies can perpetuate stigmas and make it even harder for transgender people to access appropriate medical care.

Here we focus on neuroscientific approaches to the study of transgender identity to explore how investigators might navigate these concerns.

Brain scanning

In 1995, neuroscientists at the Netherlands Institute for Brain Research in Amsterdam published findings from a post-mortem study, which included six transgender individuals 1 . They found that the volume of part of the brain’s hypothalamus — called the bed nucleus of the stria terminalis, which tends to be larger in men than in women — corresponded to the gender identity of the transgender individuals, not to their sex assigned at birth. Although the data were only correlative, the researchers suggested that people identify as transgender because of changes in the brain that happen before birth — in other words, that someone can be born with a male-typical body and brain characteristics more typical of a female brain, and vice versa.

Sex and gender in science

Since it was published, the paper has been cited more than 1,000 times, and at least a dozen researchers have probed this theory and related ones using tools such as structural and functional magnetic resonance imaging (MRI).

Although the results of these analyses have been inconsistent, several ideas have nonetheless arisen about a neurobiological basis for gender dysphoria — the distress associated with a person’s gender identity not aligning with the sex they were assigned at birth. These include the ‘own-body perception’ theory 2 , which proposes that a reduced structural and functional connectivity between certain brain networks is responsible. (Previous work has associated these networks with brain regions thought to be involved in people’s ability to link their own body to their sense of self 3 .)

As analytical tools and methods advance, brain research is becoming more sophisticated. The number of neuroscientific studies that include transgender participants has increased considerably since 1991 (see ‘On the rise’).

Some neuroscientists are using functional MRI to study the effects of hormone therapy on brain structure 4 and to examine cognitive processes such as face perception 5 . Others are applying machine-learning techniques to establish whether features in brain scans of cis- and transgender people correlate with their gender identity 6 . Researchers are also trying to assess whether particular features identified in brain scans make it more likely that transgender individuals will benefit from gender-affirming hormone therapy 7 . And some are conducting ‘mega-analyses’ — pooling the brain scans of hundreds of participants — to identify brain characteristics that are specific to transgender people 8 .

Help or harm?

One concern arising from such studies is that neuroscientific findings related to transgender identity could make it even harder for some people to access medical treatment that could help them.

In countries or regions where gender-affirming medical treatment is available, individuals often need a diagnosis of ‘gender dysphoria’ or ‘gender incongruence’ to be eligible for hormone therapy or gender-affirming surgery, and to be reimbursed for such treatments. Results from brain scans could be included in the suite of measurements used to assess whether someone is experiencing gender dysphoria or incongruence.

Those in favour of such requirements argue that it is necessary to prevent people taking irreversible steps that they might regret. Hormonal therapy can have adverse effects on fertility, for instance 9 . However, many transgender people argue that whether someone can receive gender-affirming hormone therapy or other treatment shouldn’t depend on a health-care practitioner deciding that they experience ‘enough’ gender dysphoria to be eligible 10 . The current approach, combined with a shortage of specialists qualified to make such diagnoses, has been linked to long waiting lists. In the Netherlands, waiting times can be more than two years .

A second possibility is that neuroscientific findings related to transgender identity will fuel transphobic narratives 11 .

Take the debate on social media and other platforms about gendered public spaces in countries such as the United States , the United Kingdom and Brazil 12 . Some people argue that allowing transgender women to access infrastructure, such as public toilets or women’s prisons, threatens the safety of “real women” . Neuroscientific research is sometimes misused to bolster flawed claims about what ‘real’ means.

Moreover, such studies could exacerbate tensions between scientific and transgender communities.

Scientists are aiming to identify brain characteristics that are specific to transgender people. Credit: Alain Jocard/AFP/Getty

Although cis- and transgender researchers have taken steps to improve people’s understanding, there is a history of tension between the scientific and transgender communities 13 . In the late 1980s, for instance, a sexologist argued that trans women who are mainly attracted to women experience sexual arousal from their own expression of femininity. He described their feelings of gender dysphoria as resulting from paraphilia — a sexual interest in objects, situations or individuals that are atypical 14 . This theory has not held up under broader scientific scrutiny 15 , but it has become notorious in the transgender community and, from our discussions with transgender people and discussions by other groups 16 , it is clear that such studies have reduced transgender people’s trust in science.

How four transgender researchers are improving the health of their communities

In 2021, for example, a neuroimaging study with transgender participants was suspended in the United States after backlash from the transgender community. The study would have involved showing participants images of themselves wearing tight clothes, with the intention of triggering gender dysphoria — an experience that is associated with depression, anxiety, social isolation and an increased risk of suicide. The study’s researchers had acquired ethical approval from their research institute and obtained informed consent from the participants. Yet they had failed to anticipate how the transgender community would perceive their experimental procedure.

In 2022, to learn more about how transgender people view current neuroscientific approaches to the study of transgender identity, we conducted focus-group interviews that lasted for three hours with eight transgender participants — all of whom had differing levels of knowledge about the topic.

The group expressed concern that studies that look for a neurological basis to transgender identities could have a pathologizing effect. “I think questions of aetiology are just inherently wrong,” one participant said. “We don’t ask ‘Why is someone’s favourite colour blue?’. These are questions that come from wanting to pathologize.” Participants also agreed that a biological-determinist approach does not do justice to the complex and layered experience of identifying as transgender.

Decades of work aimed at establishing how science can benefit minority groups 17 suggest that neuroscientists and other scholars could take several steps to ensure they help rather than harm transgender, non-binary and intersex individuals and other people who don’t conform to narrow definitions around sex and gender. Indeed, the four actions that we lay out here are broadly applicable to any studies involving marginalized groups.

Establish an advisory board. Researchers who work with transgender participants should collaborate with an advisory board that ideally consists of transgender people and members of other groups with relevant perspectives, including those who have some understanding of the science in question. Funding agencies should support such initiatives, to help prevent further distrust being sown because of how studies are designed.

Set up multidisciplinary teams. Researchers trained in neuroscience will view phenomena such as transgender identity through a different lens from, say, those trained in psychology. To prevent the outcomes of neuroscientific and other studies being described and published in an overly deterministic and simplistic way 18 , research teams should include social scientists. Ideally, such collaborations would also include transgender researchers or others with diverse gender identities, because their input would help to prevent a cis-normative bias in study design and in the interpretation of results. Indeed, our own group has benefited from this diversity (one of us is transgender).

Prioritize research that is likely to improve people’s lives. Neuroscientists and others engaged in research involving transgender participants, non-binary people or individuals with diverse gender identities should prioritize research questions that are likely to enhance the health of these groups. Although the applications of basic research can be hard to predict, investigations into the neurobiological impacts of hormone treatment on the brain, for instance, could be more directly informative to health-care practitioners and transgender individuals than might investigations into the underlying bases of transgender identity.

Rethink how ethical approval is obtained. Ethical boards at universities typically consist of scientists with diverse backgrounds. But it is unrealistic to expect them to be educated on the sensitivities of every minority group, whether in relation to gender, religion, ethnicity or anything else. One way to address this problem is for ethical boards to require researchers to state what feedback and other information they have gathered through community engagement. A university’s ethical review committee could then evaluate whether the researchers have done enough to understand and address people’s concerns and sensitivities.

Our aim is not to halt scientific enquiry. But when it comes to transgender identity, knowledge cannot be pursued in isolation from the many societal factors that shape how that knowledge is received and acted on.

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