1.3 Major Subdivisions of Psychology and Key Concepts from Text Notes
Professional Organizations and Diversity in Psychology
Contemporary psychology is diverse and influenced by historical perspectives; the APA reflects this diversity as the largest professional organization of psychologists in the United States.
American Psychological Association (APA)
Mission: to advance and disseminate psychological knowledge for the betterment of people.
Size and scope: largest organization of psychologists in the world; includes 54 divisions representing a wide variety of specialties (examples include Societies for the Psychology of Religion and Spirituality, Exercise and Sport Psychology, Behavioral Neuroscience and Comparative Psychology).
Membership: spans from students to doctoral-level psychologists; professionals come from educational settings, criminal justice, hospitals, the armed forces, and industry. divisions; historical snapshot: APA, 2014.
G. Stanley Hall
First president of the APA.
Background: adjunct instructor at Wilberforce University (an HBCU) while serving at Antioch College; earned PhD under William James; became the first president of Clark University (Massachusetts).
Association for Psychological Science (APS)
Founded in to advance the scientific orientation of psychology.
Origin: disagreement between scientific and clinical branches within the APA.
Activities: publishes five research journals; engages in education and advocacy with funding agencies.
Membership: significant international representation; majority located in the United States.
Other professional networks
Groups focused on specific communities and backgrounds, providing networking and collaboration: National Latina/o Psychological Association (NLPA), Asian American Psychological Association (AAPA), Association of Black Psychologists (ABPsi), Society of Indian Psychologists (SIP).
Common aim: study psychological and social issues within their communities.
Overview of subdivisions
This section provides an overview of major subdivisions within psychology today, ordered by how they are introduced in the textbook.
Note: not an exhaustive listing, but highlights major areas of research and practice in modern psychology.
Biopsychology and Evolutionary Psychology
Biopsychology (biological psychology)
Focus: how biology influences behavior; seeks to understand how the structure and function of the nervous system relate to behavior.
Interdisciplinary approach: blends methods of psychology and physiology; often considered a component of neuroscience.
Research domains: sensory and motor systems, sleep, drug use and abuse, ingestive behavior, reproductive behavior, neurodevelopment, plasticity of the nervous system, and biological correlates of psychological disorders.
Researchers come from diverse backgrounds (biologists, medical professionals, physiologists, chemists); neuroscience is a broader interdisciplinary framework that encompasses biopsychology.
Evolutionary psychology
Focus: ultimate biological causes of behavior (genetic determinants) and how behavior adapts to past environments via natural selection.
Key idea: behaviors that are genetically influenced may be expressed across cultures due to shared genetic basis; however, cultural variation can modulate expression.
Origins and reasoning
Darwinian foundation: adaptive behaviors and evolutionary explanations for human behavior.
Foundational works: The Descent of Man (1871) and The Expression of the Emotions in Man and Animals (1872).
Methodological approach: formulate predictions from evolutionary theory and conduct observations/experiments to test whether results align with theory.
Limitations and critiques
Not all studies provide strong evidence of adaptiveness; some assume genetic determinants (Endler, 1986; Confer et al., 2010).
Traits may reflect historical environments that are not well understood; what was adaptive in the past may not be adaptive now, and vice versa.
Areas of interest where evolution can make predictions
Memory, mate choice, kin relationships, friendship and cooperation, parenting, social organization, status.
Representative cross-cultural finding
Buss (1989): across 37 cultures, women valued earning potential more than men, while men valued youth and attractiveness more than women in potential mates; overall patterns aligned with evolutionary predictions, with some cultural deviations.
Sensation and Perception
Research scope
Interdisciplinary: investigators study both physiological aspects of sensory systems and the psychological experience of sensory information.
Everyday example of perception
Perception is not merely the sum of sensations; it is influenced by attention, prior experiences, and cultural background.
Figure reference
Figure 1.11 illustrates perceptual ambiguity (e.g., an image that can be seen as a duck or a rabbit).
Cognitive Psychology
Core focus
Cognitions: thoughts and their relationship to experiences and actions.
Breadth and interdisciplinarity
Topics span attention, problem solving, language, memory, and beyond.
Often described within the broader umbrella of cognitive science due to interdisciplinary collaborations.
Connections to the textbook
Given the diversity, cognitive psychology is not confined to a single chapter; related concepts appear in chapters on sensation and perception, thinking and intelligence, memory, lifespan development, social psychology, and therapy.
References
Miller (2003) discusses the interdisciplinary nature of cognitive science.
Developmental Psychology
Definition and scope
Scientific study of development across the lifespan; includes physical maturation as well as cognitive skills, moral reasoning, social behavior, and other psychological attributes.
Early developmental work
Jean Piaget demonstrated that very young children do not demonstrate object permanence (but see Munakata, McClelland, Johnson, and Siegler, 1997 for discussion of controversy).
Object permanence
Understanding that physical objects continue to exist even when hidden; achieved at different developmental stages (age of acquisition is debated).
Aging and demographics
Increasing interest in changes in later life due to aging populations.
Population aging in the U.S.:
2010: people aged 65 or older.
2020: people aged 65 or older.
2050: people aged 65 or older. (Department of Health and Human Services, n.d.)
Personality Psychology
Focus
Patterns of thoughts and behaviors that make individuals unique.
Historical contributors
Early theories from Freud and Maslow; Gordon Allport contributed to trait-based approaches.
Freudian theory emphasized conflicts between conscious and unconscious mind and psychosexual stages; controversial and not easily testable experimentally (Person, 1980).
Modern approach
Trait theory emphasizes stable patterns of thought and behavior across contexts.
The Five Factor Model (Big Five): Conscientiousness, Agreeableness, Neuroticism, Openness, Extraversion.
Big Five and stability
Each dimension tends to be relatively stable across the lifespan; genetic influences are acknowledged (e.g., Jang, Livesley, and Vernon, 1996).
Figure reference
Figure 1.13 illustrates the Five Factor model and the continuum for each trait.
Social Psychology
Focus
How we interact with and relate to others; study of social influence, group dynamics, and interpersonal processes.
Key topics
Explanations of behavior (self vs others), prejudice, attraction, and conflict resolution.
Historical and ethical context
Milgram’s obedience studies revealed that many participants were willing to follow authority to the point of delivering what they perceived as deadly shocks (
after the Holocaust, 1961).
Experimental setup and deception
Participants believed they were delivering shocks to another person; deception and potential harm raised ethical concerns; use of confederates with clear directions (Hock, 2009).
Consequences for research ethics
Milgram and other studies catalyzed the development of ethical guidelines discouraging deception unless harm is minimized or justified and informed consent is obtained.
Milgram’s study (Figure 1.14)
Demonstrated the extent to which people obey authority figures.
Industrial-Organizational Psychology
Domain and applications
Applies psychological theories, principles, and research to industrial and organizational settings.
Focus on personnel management, organizational structure, and workplace environment.
Practical impact
I-O psychologists help organizations with hiring decisions and designing environments that promote high levels of productivity and efficiency.
Research component
Involves conducting rigorous scientific research on behavior within I-O settings (Riggio, 2013).
Health Psychology
Core focus
How health is affected by the interaction of biological, psychological, and sociocultural factors (biopsychosocial model).
Goals and activities
Help individuals achieve better health through public policy, education, intervention, and research.
Research themes
Investigate relationships among genetic makeup, behavior, relationships, psychological stress, and health.
Develop effective strategies to motivate health-promoting behaviors and address risky patterns.
Figure reference
Figure 1.15 illustrates the biopsychosocial model of health.
Sport and Exercise Psychology
Focus
Psychological aspects of sport performance, including motivation and performance anxiety; effects of sport on mental and emotional wellbeing.
Scope
Also investigates how sport and exercise relate to broader health outcomes.
Broad relevance
Topics extend beyond sport to include the interplay of mental and physical performance under demanding conditions (e.g., firefighting, military operations, artistic performance, surgery).
Clinical Psychology and Counseling Psychology
Clinical psychology
Focus: diagnosis and treatment of psychological disorders and problematic patterns of behavior; highly applied.
Some clinicians also engage in scientific research.
Counseling psychology
Similar to clinical psychology but focused on emotional, social, vocational, and health-related outcomes in psychologically healthy individuals.
Historical and theoretical influences
Freud and Rogers provided influential perspectives:
Psychoanalytic theory (psychodynamic approaches) influenced some clinicians.
Carl Rogers’ client-centered therapy has shaped many therapeutic practices.
Therapeutic approaches in practice
Behaviorism and the cognitive revolution shaped clinical practice with:
Behavioral therapy
Cognitive therapy
Cognitive-behavioral therapy (CBT)
Figure reference
Figure 1.16 illustrates cognitive-behavioral therapy (CBT) as a common integrated approach.
Coverage in the textbook
Issues related to diagnosis and treatment are discussed in detail in later chapters.
Forensic Psychology
Role and scope
Branch of psychology applied to questions arising in the context of the justice system.
Typical duties
Assess competency to stand trial, assess mental state of defendants, consult on child custody cases, provide sentencing and treatment recommendations, advise on eyewitness testimony and children’s testimony (American Board of Forensic Psychology, 2014).
Serve as expert witnesses in court, representing research- or experience-based opinions.
Involvement in jury selection and witness preparation.
Practitioner composition
Forensic psychologists may also provide psychological treatment within the criminal justice system.
Criminal profiling
A relatively small proportion of psychologists act as consultants for law enforcement (i.e., criminal profilers).
Legal and methodological bridge
Professionals must integrate understanding of law with psychological research to inform legal decisions.
Notes on Figures and References in the Text
Figure 1.10: Invitation to visit APA divisions website for more information and to view student resources (APA).
Figure 1.11: Ambiguous perception example (duck vs. rabbit) illustrating how perception can differ from the sensory input.
Figure 1.12: Jean Piaget’s work on cognitive development and object permanence.
Figure 1.13: Visual representation of the Big Five personality traits.
Figure 1.14: Milgram’s obedience study depiction (advertising and setup).
Figure 1.15: The biopsychosocial model of health.
Figure 1.16: Cognitive-behavioral therapy as a core clinical approach.
Key Concepts and Equations (Summary)
Big Five personality traits
Population aging statistics (U.S.)
Milgram obedience proportion
Approximate obedience rate: of participants under authority pressure.
Evolutionary predictions and caveats
Evolutionary psychology uses genetic and adaptive explanations, but strong evidence requires careful separation of genetic vs cultural contributions; outcomes should be interpreted with caution due to historical environmental conditions.
Biopsychosocial model
Health outcomes are determined by the interaction of , with each component contributing to health and illness in different ways.
Connections to Foundational Principles and Real-World Relevance
APA and APS reflect the field’s commitment to scientific rigor, professional standards, and broad accessibility across diverse settings (education, justice, healthcare, industry).
Biopsychology and evolutionary psychology connect neural mechanisms to behavior and provide a framework for explaining human behavior across contexts and cultures.
Sensation, perception, and cognitive psychology highlight how our experiences are constructed, not merely recorded, which informs fields from UX design to education and clinical assessment.
Developmental psychology offers insight into aging populations and life-span changes, relevant for policy, healthcare, and education planning.
Personality psychology’s Big Five informs hiring, mental health risk assessment, and understanding interpersonal dynamics.
Social psychology’s insights into obedience, prejudice, and social influence have ethical and policy implications for research practices, organizational management, and societal norms.
Industrial-Organizational psychology translates theory into practices that improve productivity, safety, and employee wellbeing.
Health psychology demonstrates the importance of integrating biological, psychological, and social factors in health promotion and disease prevention.
Sport and exercise psychology links mental factors to performance and wellbeing, with applications in education, rehabilitation, and occupational settings.
Clinical and counseling psychology provide foundational approaches to treating disorders and supporting healthy functioning, incorporating evolving theories from psychodynamic to CBT perspectives.
Forensic psychology illustrates the intersection of psychology and law, emphasizing the need for rigorous scientific expertise within legal processes.
This set of notes captures the major and minor points, theories, figures, and empirical findings outlined in the transcript, formatted as comprehensive, study-ready bullet notes with LaTeX-style math where appropriate.