History of Psychology

René Descartes

Doubted everything; dualist who argued all bodies can be explained as physical mechanisms, but could not completely explain the relationship between the mind or soul and the body.

Aristotle & Galileo

Historical philosophical/scientific figures noted alongside early mechanistic and analytical thinking.

John Locke

Disagreed with Descartes; empiricist who posited that all knowledge is gained through sensory experience and that the human mind at birth is a blank slate ('Tabula Rasa'). We compensate for our single perspective through science.

Gottfried Wilhelm Leibniz

Disagreed with Locke's tabula rasa, comparing the mind to a chiseled block of marble; believed that everything in existence was composed of fundamental, dynamic entities called Monads.

Franz Joseph Gall

Pioneered phrenology by dividing the brain into distinct regions based on feeling the shape of the skull, associating cortical regions with specific mental faculties.

Jean Pierre Flourens

Disagreed with Gall's localization; used surgical ablations on animals to conclude that the brain works together as an integrated whole rather than individual isolated parts.

Paul Broca & Carl Wernicke

Revived cortical localization; Broca discovered the speech production center ('Broca's area') via his patient 'Tan'. Wernicke discovered the speech comprehension center.

Eduard Fritsch & Eduard Hitzig

Used electrical stimulation electrodes in animal brains to show that different areas triggered different motor actions, discovering the motor and sensory cortex.

Shepherd Ivory Franz & Karl Lashley

Conducted rat maze experiments while performing cortical ablations; formulated the Law of Mass Action, stating that memory and learning depend on the total mass of cortex remaining rather than a specific locus.

Wilder Penfield

Used electrical stimulation in the brain during neurosurgery to map cortical functions and see where memory was stored; noted alongside H.M., who had his hippocampus removed.

Immanuel Kant

Feared David Hume's assertion that there is 'no causality' in the world; believed we view the world through a priori categories of time and space. Viewed the mind as a black box that could never be scientifically studied, declaring that psychology could never be a true science.

Hermann von Helmholtz

Proved Kant wrong by measuring the speed of nerve impulses, establishing that reaction times could be studied empirically to analyze the mind's response to the world. Contributed to the conservation of energy (Wet behoud van energie) and the trichromatic color vision theory.

Gustav Fechner

Suffered from depression; developed Fechner's Law (S = k * ln(R/R0)) to mathematically map the logarithmic relationship between physical stimulus intensity and psychological sensation, noticed via weight differences.

Gestalt Psychologists

Studied holistic perception, notably demonstrating the Phi Phenomenon where a sequence of still images is perceived as continuous motion.

Wilhelm Wundt

Established the first large-scale experimental psychology laboratory in Leipzig; extensively researched reaction times using apparatuses like the tachistoscope and chronoscope. Managed numerous students and authored 'Völkerpsychologie' alongside voluntaristic psychology.

Edward Bradford Titchener

Brought structuralism to America based on Wundt's work but failed to include Wundt's more nuanced approach; defined structuralism as breaking down consciousness into basic elements using strict introspection.

Hermann Ebbinghaus

Pioneered the experimental study of human memory by testing himself using lists of nonsense words; disagreed with Wundt's assertion that higher mental processes could not be scientifically studied.

Charles Robert Darwin

Formulated the theory of evolution by natural selection; influenced by Charles Lyell's geology book during his voyage on the HMS Beagle.

Alfred Russel Wallace

Independently conceived the theory of evolution through natural selection during a fever dream, prompting Darwin to publish his own work.

Thomas Henry Huxley

Known as 'Darwin's Bulldog' for his aggressive and passionate public defense of evolutionary theory.

Herbert Spencer

Coined the phrase 'Survival of the fittest' and developed Social Darwinism, a philosophical rather than biological stance arguing that every aspect of life is evolution and society should not interfere with natural selection.

Francis Galton

Pioneered the psychology of individual differences after concluding from Darwin's work that genius is hereditary; advocated for positive eugenics and explored the interplay of nature versus nurture.

Alphonse de Candolle

Disagreed with Galton's extreme hereditary views, arguing that environmental nurture and socioeconomic factors were also deeply important in creating a genius.

William James

From a prominent family but struggled with severe depression; chose to believe in free will after reading Alexander Bain's work on habits to force himself to be happier. Championed pragmatism (the truth of an idea is judged by its utility), described the 'Stream of Consciousness', and posited that physiological emotion precedes the psychological feeling.

G. Stanley Hall

Taught alongside William James; started the first American psychology journal and founded the APA out of a sense of personal grief. Conducted pioneering child studies in developmental psychology, coined the term 'adolescence', and advocated for recapitulation theory.

Mary Whiton Calkins

Faced educational barriers because she was a woman but studied under James and Münsterberg; invented the paired-associates test for memory research; denied her well-earned Ph.D. from Harvard due to institutional sexism.

Edward Lee Thorndike

Sought a quick Ph.D. by studying learning in chickens before switching to cats in custom puzzle boxes; established trial-and-error learning and formulated the Law of Effect.

Ivan Pavlov

Won a Nobel Prize scholarship; primarily interested in digestive tracts and animal physiology, famously discovering classical conditioning when dogs salivated before entering the food room.

John Broadus Watson

Overcame early school difficulties to lead animal psychology, developing an inferiority complex; became department leader following a scandal; popularized Behaviorism focused on prediction and control, famously testing emotional conditioning on 'Little Albert' before transitioning to advertising and writing behaviorist infant care manuals.

Mary Cover Jones

Conducted the famous 'Little Peter' study, demonstrating de-conditioning and counter-conditioning of a fear response, contrasting Watson's work.

B.F. Skinner

Turned to behaviorism after suffering from writer's block; inspired by Watson and Pavlov to develop the Skinner Box for operant conditioning; identified variable/fixed interval and ratio reinforcement schedules; advocated for programmed instruction and wrote the utopian novel 'Walden Two'.

Franz Anton Mesmer

Developed Mesmerism (animal magnetism); used a 'baquet' to treat patients, but was forced to flee Vienna after a controversial cure of a blind pianist; investigated and discredited by the French Blue Ribbon commission.

Marquis de Puységur

Discovered 'artificial somnambulism' (a deep, sleep-like hypnotic state) as a modification of Mesmer's magnetic sleep.

James Braid

Renamed animal magnetism to 'hypnotism', shifting the practice toward a neurophysiological and psychological explanation.

Jean-Martin Charcot & The Nancy School

Central figures in the Nancy-Salpêtrière controversy; Charcot viewed hypnosis as a physical symptom of hysteria, while the Nancy school viewed it as a normal product of universal psychological suggestibility.

Alfred Binet

Initially misstepped in hypnosis research ('cholera of psychology') facing public embarrassment, but pivoted to objective experiments on suggestibility, object permanence, and individual psychology, ultimately creating the first successful IQ-tests.

Joseph Delboeuf

Belgische filosoof en psycholoog die kritiek leverde op de hypnotische theorieën van Charcot en bijdroeg aan het aantonen van de rol van suggestie.

Gustave Le Bon

Wrote 'The Crowd: A Study of the Popular Mind', exploring how individuals lose their personal identity and succumb to suggestibility within a crowd crowd.

Floyd H. Allport

Prominent early social psychologist who co-edited the Journal of Abnormal and Social Psychology (JASP).

Stanley Milgram

Conducted famous and controversial obedience shock experiments; also demonstrated the concept of six degrees of separation.

Sigmund Freud

Founded psychoanalysis; investigated Bertha Pappenheim's (Anna O.) transference and infatuation, transitioned from hypnosis to free association, proposed the seduction theory of hysteria, wrote 'The Interpretation of Dreams', and developed structural concepts like the Oedipus complex, psychosexual stages, Thanatos, and womb/penis envy.

Alfred Adler

Broke from Freud to focus on individual psychology; asserted humans strive for independence to overcome an inferiority complex, emphasized 'social interest' over the therapeutic couch, and studied the birth order effect.

Carl Jung

Broke away from Freud due to disagreements regarding the overemphasis on sexual drives; developed analytical psychology, introducing concepts like extraversion and introversion.

Gordon Allport

Met Freud at Harvard before studying postgraduate Gestalt psychology in Germany; pioneered trait theory using a lexical approach and introduced the distinction between nomothetic (general laws) and idiographic (individual focus) research methodologies.

Henry A. Murray

Developed the Thematic Apperception Test (TAT), a projective psychological test evaluating an individual's subconscious needs and dynamics.

Abraham Maslow

A founder of Humanistic Psychology; studied peak 'aha' moments, self-actualization, the Hierarchy of Needs, and laid early foundations for positive psychology.

Carl Rogers

A major figure in humanistic psychology who pioneered client-centered therapy, emphasizing unconditional positive regard and empathy.

Henry H. Goddard

Translated Binet's intelligence test into English; introduced the clinical term 'moron', and used negative eugenics and his study on the 'Kallikak' family to argue against the reproduction of the mentally unfit.

David Wechsler

Developed modern standardized intelligence scales (WAIS/WISC) based on a normal distribution with a mean of 100 and a standard deviation of 15 ($N\sim(15;100)$).

Jean Piaget

A gifted child who became a monumental developmental psychologist; formulated the Stage Theory of Cognitive Development consisting of the Sensorimotor, Preoperational, Concrete Operations, and Formal Operations stages.

Lev Vygotsky

Soviet developmental psychologist who introduced the Zone of Proximal Development (ZPD) to emphasize the social context of cognitive growth.

Hugo Münsterberg

Pioneered applied psychology, comparing it to engineering in physics; wrote 'On the Witness Stand' concerning forensic psychology, and faced ultimate professional alienation due to his fierce German nationalism.

Frederic Winslow Taylor

Developed scientific management ('Taylorism') to combat 'soldering' (workers intentionally slowing down output); introduced the differential piece-rate system to tie wages to productivity metrics.

Walter Dill Scott

Pioneered the psychology of advertising and designed early large-scale psychological selection and placement tests for military soldiers.

William Moulton Marston

Invented an early form of the polygraph lie detector; also famous for creating the comic book superhero icon Wonder Woman.

Lilian Moller Gilbreth & Frank Gilbreth

Husband-and-wife industrial engineering team who pioneered motion studies and invented micro-motion elements called 'therbligs'; focused on finding 'the one best way' to optimize tasks, and Lilian chose to continue their work alone after Frank's sudden death.

Elton Mayo

Led the landmark Hawthorne Studies at Western Electric, which discovered the 'Hawthorne Effect' where employees' productivity changes simply because they are being observed or feel valued.

Harry Hollingworth

Conducted the classic Coca-Cola caffeine study proving that caffeine didn't impair performance; also did research disproving the variability hypothesis that claimed men were more variable than women.

Molly Harrower

Clinical psychologist who studied individuals undergoing neurosurgery and pioneered the use of the Rorschach inkblot test to help identify brain tumors.

David Shakow

Formulated the scientist-practitioner model for clinical psychology training; criticized psychoanalytic subjectivity in an episode dubbed 'Shakow's Folly'.

Starke Hathaway

Co-developed the Minnesota Multiphasic Personality Inventory (MMPI), incorporating psychological validity control scales like the L-scale (Lie) and K-scale (Correction).