Ibn al-Haytham
He didn’t just study light—he invented the scientific method for perception.
Neuroscience
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Abraham Maslow
Maslow didn’t measure self-actualisation—he curated it from heroes he admired.
Asch conformity experiments
Solomon Asch
The Asch experiments show that unanimous group pressure causes public conformity on simple perceptual judgments — not because people misperceive, but because they yield in speech. The effect is real, quantified, and limited: it depends on unanimity, not large numbers; it was tested only on white male undergraduates; and it measures response, not belief or vision.
Cocktail party effect
Colin Cherry named the cocktail party problem in 1953 after studying how people follow one conversation among many, and found listeners still noticed their own name in speech they were supposedly ignoring — a small detail that broke the theory built to explain it.
B. F. Skinner
Skinner didn’t explain minds — he replaced them with measurable behaviour and its consequences.
Brain-derived neurotrophic factor
Yves-Alain Barde
BDNF was isolated from pig brain tissue in 1982 by Yves-Alain Barde and Hans Thoenen, identifying it as a distinct protein.
Carl Rogers
Therapy isn’t about what you say — it’s about how you hold space, and in 1941 they proved it with tape recorders.
Carol Dweck
Praising intelligence isn’t kind—it’s a trap that makes people avoid hard work.
Universal grammar
Chomsky's claim that children are born with an innate grammatical template has narrowed over sixty years to a single computational operation, and remains genuinely contested rather than settled either way.
Cognitive bias
Amos Tversky and Daniel Kahneman's 1970s experiments found people rate a detailed, statistically impossible scenario as more probable than a plain one — evidence that judgment runs on shortcuts, not pure logic, a claim that reshaped economics and drew its own rationality war.
Edward Thorndike
Thorndike didn’t discover how animals learn—he proved how they don’t.
Elizabeth Loftus
Memory isn’t stored — it’s rewritten every time you’re asked a question.
Ernst Mach
Mach didn’t discover relativity — he photographed shock waves and mapped how your inner ear keeps you upright.
Functional magnetic resonance imaging
Seiji Ogawa
Ogawa’s 1990 work established the BOLD effect — a measurable, oxygenation-dependent MRI signal shift in rodent brain tissue — verified with blood samples and EEG correlation. It is the physical foundation of human fMRI, but maps vascular response, not neural activity directly.
Ivan Pavlov
Pavlov won the Nobel Prize for stomach surgery — not salivation. The dog’s drool was a footnote, not the finding.
Jean Piaget
Piaget didn’t discover how children think—he discovered that we’d been misreading their wrong answers all along.
Karl von Frisch
Bees don’t just react — they compute direction, time, and identity with senses we lack.
Lawrence Kohlberg
Kohlberg did not discover morality—he invented a ruler for one kind of moral talk.
Melatonin
American and European sleep guidelines look at the same melatonin evidence and reach opposite conclusions about treating insomnia, and this brief follows that split alongside what melatonin actually does in the body before it ever reaches a bottle.
Milgram experiment
In 1961, months after Adolf Eichmann's trial opened, Stanley Milgram found 65 per cent of volunteers at Yale would deliver what they believed was a 450-volt shock to a stranger simply because told to continue — far more than psychiatrists had predicted.
Neurotransmitter
Otto Loewi's 1921 experiment transferred fluid from one stimulated frog heart to a second, unconnected heart, and it slowed too — evidence that nerves signal with a released chemical rather than electricity alone, and the start of a search for what else nerves release.
Henry Molaison
Henry Molaison's 1953 surgery destroyed his ability to form new memories but left skill learning intact, giving Brenda Milner decades of evidence that declarative and procedural memory are genuinely separate systems.
REM rebound
William Dement's REM-deprivation experiments showed the brain pushes back when a sleep stage is withheld, and that push-back, not sleep loss in general, is what REM rebound actually measures.
Detection theory
Signal detection theory, formalised in 1954 out of radar research and set out for psychology by Green and Swets in 1966, split a single accuracy score into two things: how well someone can actually tell signal from noise, and how readily they say yes at all.
Snake venom
Snake venom is a mixture of enzymes and peptides, not a single poison, and its neurotoxins each interrupt one precise step in how a nerve signals a muscle — a mechanism well established even where the broader classification of venom types is not.
Stanford prison experiment
Philip Zimbardo
The Stanford prison experiment was a 1971 simulation study conducted by Philip Zimbardo at Stanford University, using 24 male college students randomly assigned as prisoners or guards in a mock prison in the psychology building basement. Its goal was to assess the psychological effects of role assignment, focusing on how roles, rules, symbols, group identity, and situational forces shape behavior. Results showed rapid, extreme role adaptation by both groups, leading to dangerous and psychologically damaging conditions; Zimbardo himself became immersed in his role as superintendent until intervened by Christina Maslach. The core conclusion was that situational forces can exert far greater influence on behavior than commonly recognized.
Blood–brain barrier
Paul Ehrlich
Ehrlich’s intravenous dye experiments revealed selective absence of brain staining — but he misinterpreted it as passive under-uptake. His student Goldmann’s 1913 intracerebrospinal injection proved compartmentalization. The barrier was attributed to blood vessels, not a membrane. Ehrlich never believed in it. The term came later, from Lina Stern.
Adult neurogenesis
In November 1998 Peter Eriksson and Fred Gage reported that the adult human brain does, after all, grow new neurons, overturning decades of dogma that people are born with a fixed supply — a claim a prominent 2018 study concluded may not hold in adults at all.
Color constancy
Edwin Land, better known for instant photography, showed in 1959 that projecting light from just two narrow wavebands could still make an audience see a full range of colour — evidence that colour depends on the brain comparing surfaces, not reading wavelength alone.
Long-term potentiation
In 1973 Timothy Bliss and Terje Lømo showed that briefly stimulating a pathway in a rabbit's brain left its synapses firing harder for hours afterward — physical evidence for Donald Hebb's 1949 idea that repeated use is what strengthens a connection between neurons.
Mirror neuron
In the early 1990s a Parma laboratory found monkey brain cells that fired both when the animal grasped food and when it merely watched someone else grasp it — a finding since stretched into theories of empathy, language and autism that the evidence itself struggles to support.
Neuroplasticity
Michael Merzenich's monkey experiments in the 1980s showed a hand map in the brain redrawing itself after nerve surgery, overturning the assumption that adult brain wiring was fixed — a finding since used, and sometimes oversold, to build a commercial brain-training industry.
Prion
Stanley Prusiner proposed that an infectious agent could be a misfolded protein with no genetic material at all — a claim his own field initially rejected as impossible.
Rapid eye movement sleep
Kleitman and Aserinsky's 1953 discovery gave dream research a measurable brain state, rapid eye movement sleep, but seven decades on, what REM sleep actually evolved to do remains a genuinely open question.
Synesthesia
A rigorous population study put synesthesia, the blending of senses so letters carry colour or sounds carry taste, at 4.4 per cent of people — far below folklore's one in four, and far above the one-in-tens-of-thousands earlier, self-selected samples had produced.
James J. Gibson
James Gibson argued that we perceive a chair or a staircase directly as something to sit on or climb, not as raw shape our brain then interprets — a claim that gave design and robotics the word affordance, which promptly split into two incompatible meanings.
Enkephalin
In 1975 researchers identified enkephalin, a chain of just five amino acids made in the brain, as a substance the body produces on its own that binds the very receptors morphine does — the first sign of a whole family of the body's own pain and reward chemistry.
Flynn effect
IQ scores rose steadily for a century — but that doesn’t mean we got smarter.
Golgi apparatus
Camillo Golgi
Camillo Golgi discovered the Golgi apparatus in 1898 using osmium dichromate staining on barn owl Purkinje cells. He named it 'apparato reticolare interno' and asserted it was a real, unique cellular component. Initial scepticism held that it was an optical illusion. The finding was not firmly established until electron microscopy emerged ~50 years later. It revealed a new intracellular structure but gave no insight into its function, mechanism, or universality.
Patch clamp
Sealing a glass pipette tightly enough against a cell membrane cut background electrical noise so far down that Erwin Neher and Bert Sakmann could finally watch a single ion channel molecule opening and closing, something no earlier technique could isolate at all.
Replication crisis
In 2015 a coordinated effort to redo 100 published psychology experiments found only 36 per cent reproduced the original significant result, effect sizes roughly halved on average — a number that turned scattered doubts into a named crisis.
Split-brain
Sperry and Gazzaniga's split-brain experiments showed real hemisphere specialisation and a left-brain 'interpreter' that invents confident reasons for actions it didn't cause, but not the tidy left-brain, right-brain myth it spawned.
Ion channel
Roderick MacKinnon's 1998 crystal structure of a bacterial potassium channel showed the shape that lets potassium pass freely while turning away the smaller sodium ion — a puzzle that had stood since Hodgkin and Huxley's electrical studies of the 1950s.
Theory of mind
Wimmer and Perner's 1983 false-belief task, staged as the Sally-Anne test with two dolls and a moved marble, showed children under about four cannot yet grasp that someone else can believe something the child knows to be false — a milestone since disputed on what it measures.
Viktor Frankl
Meaning is not discovered — it is assigned, argued for, and clinically deployed.
Baddeley's model of working memory
Alan Baddeley and Graham Hitch · 1974
Baddeley and Hitch’s 1974 model reframed working memory as a set of interacting, domain-specific components — not a single bottleneck. Dual-task interference, the word length effect, and amnesic patient profiles provide direct empirical support. Later additions (episodic buffer in 2000, renamed awareness buffer in 2026) extend but do not overturn the core claim of fractionation. It remains indispensable — not because it is complete, but because it is falsifiable, componential, and repeatedly predictive.