Lecture 1: History & Foundational Concepts of Psychology

Psychology

The scientific study of mind and behavior (psyche = soul/mind, logos = study of)

Ancient Egypt's contribution

First to link traumatic brain injuries directly to behavioral changes

Plato's view

Nativism (nature): knowledge is innate

Aristotle's view

Philosophical empiricism (nurture): knowledge is acquired through experience

Nativism vs empiricism

Nativism (Plato) = nature, innate knowledge. Empiricism (Aristotle) = nurture, knowledge from experience

Hippocrates

Created the first personality classification system, based on the four humors (blood, yellow bile, black bile, phlegm)

Charles Darwin

Proposed natural selection ("survival of the fittest"). Adaptive behaviors are shaped by natural selection

Phrenology

Discredited theory that mental abilities and personality traits are localized in brain regions and can be read by feeling bumps on the skull

Phineas Gage

Railroad worker who survived an iron rod through his frontal lobe. His impulsivity and personality change showed specific brain regions control specific behaviors (localization of function)

Why Phineas Gage matters

Direct evidence of localization of brain function: frontal lobe damage altered personality and impulse control without killing him

Wilhelm Wundt (1879)

Founded the 1st experimental psychology lab in Leipzig, Germany. Marks the birth of psychology as a formal science

Structuralism

Wundt and Titchener. Breaks conscious experience into basic component elements using introspection

Introspection

Subjective self-observation of one's own conscious experience (the method of structuralism)

Limitations of structuralism

Highly subjective, inconsistent results between individuals, and cannot access unconscious processes

Functionalism

William James. Focuses on the purpose and function of behavior and mental processes (what the mind does, not its structure). Influenced by Darwin

Structuralism vs functionalism

Structuralism = structure of consciousness via introspection. Functionalism = adaptive purpose of mental processes

Behaviorism

John B. Watson and B.F. Skinner. Studies only observable behavior and rejects unobservable mental states to make psychology objective

Limitation of behaviorism

Ignores internal cognitive, emotional, and evolutionary influences

Cognitive psychology

Rose in the 1950s/60s (George Miller, Ulric Neisser). Re-introduced internal mental processes (memory, attention, perception, language) as objective subjects. Uses computer analogies for information processing

Behaviorism vs cognitive psychology

Behaviorism ignores internal mental events and studies only observable actions. Cognitive psychology brings back scientific study of internal mental processing

Psychoanalytic theory

Sigmund Freud. Behavior and personality are driven by unconscious motives, memories, and conflicts

Limitations of psychoanalytic theory

Hard to test scientifically and overemphasized sexual and aggressive drives

Cross-cultural psychology

Examines how cultural background influences individual and group behavior. Addresses historical sampling biases

WEIRD

Western, Educated, Industrialized, Rich, Democratic

WEIRD bias statistics

About 96% of research subjects come from WEIRD societies, which represent only about 12% of the global population

Implication of WEIRD bias

Findings may reflect cultural norms rather than universal human behavior. Cross-cultural verification is needed before generalizing

Basic research

Goal is to expand knowledge and understand fundamental processes (biological, cognitive, developmental, social)

Applied research

Goal is to solve practical real-world problems (clinical, educational, forensic, I/O)

Translational research

Bridges basic research findings directly into practical applications

Biological/neuroscience psychology

Studies brain structure, neurons, and neurotransmitters

Cognitive psychology (subfield)

Studies thinking, memory, and attention

Developmental psychology

Studies psychological changes across the lifespan

Social psychology

Studies how individuals influence and interact with one another

Clinical psychology

Applied. Diagnosing and treating mental illness

Educational psychology

Applied. Improving teaching methods and learning diagnostics

Forensic psychology

Applied. Applying psychological concepts to legal and criminal matters

Industrial-organizational (I/O) psychology

Applied. Optimizing behavior and productivity in workplaces