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Evolutionary psychology
1992 (The Adapted Mind)· School or movement
Mixed evidenceSome support; effects smaller or less consistent than once thought.
Studies the mind as a set of adaptations shaped by natural selection to solve problems our ancestors faced.
See it on the Psychology map →What it says
The field's founding text was The Adapted Mind (1992), edited by Jerome Barkow, Leda Cosmides and John Tooby. It asks what problem a mental trait solved in hunter-gatherer life: avoiding snakes, choosing mates, detecting cheaters, caring for kin. David Buss's 1989 survey of 37 cultures found that, on average, men weighted looks and women weighted earning prospects somewhat more. Critics warn that plausible 'just-so stories' are easy to invent and hard to test.
Why it matters
It ties psychology to biology, offering one framework for universal emotions, fears, mate choice and in-group bias, and explaining why modern settings can mismatch ancient instincts.
Think of it like
Like an old warehouse converted to offices: odd features make sense once you know what the building was originally built to do.
The evidence
Status: mixed. Evidence comes from cross-cultural surveys, hunter-gatherer studies, primate comparisons and experiments. Some findings hold widely; others, such as claimed shifts in women's preferences across the menstrual cycle, weakened on retesting.
Open questions
How 'modular' the mind is, many specialized programs or one flexible learner, and how well we can really know the ancestral environment.
Connections (5)
▸Functionalism: studying what the mind is for foreshadowed Evolutionary psychologyWell replicated
The connection
Both ask Darwin's question about the mind: what is it for? Functionalists studied how habits and consciousness help a person adapt; evolutionary psychology, a century later, asks which mental adaptations natural selection built for ancestral life. In between, behaviorism largely set evolution aside until ethology and sociobiology revived it.
Who showed it and when
Functionalism at Chicago and Columbia, 1890s–1920s; evolutionary psychology from the late 1980s, led by Leda Cosmides and John Tooby, later at UC Santa Barbara.
The evidence
Tooby and Cosmides explicitly credit William James's argument that humans have more instincts than other animals, not fewer, and are blind to them.
Open questions
This is a kinship of ideas, not a direct line of teachers and students; how consciously the 1990s field built on functionalism is debatable.
▸Evolutionary psychology is a recent branch of Scientific psychology (Wundt's Leipzig lab, 1879)Well replicated
The connection
Evolutionary psychology applies Darwin to the mind, using psychology's standard tools (experiments, surveys, cross-cultural comparisons) to test whether traits look like adaptations. Darwin predicted it in 1859, writing that psychology would rest on a new foundation: each mental power acquired by gradual steps. The branch took shape in the late 1980s and 1990s.
Who showed it and when
Late 1980s–1990s, drawing on cognitive psychology, anthropology and E. O. Wilson's sociobiology (1975); key centers at UC Santa Barbara, Michigan and Texas.
The evidence
It has its own scholarly society, journals such as Evolution and Human Behavior, standard textbooks and university programs.
Open questions
Whether it is one branch or a lens for all of psychology, and whether its methods are rigorous; philosopher David Buller's 2005 critique sparked lasting debate.
▸Evolutionary psychology offers a survival-based account of Ekman's basic emotions and universal facesMixed evidence
The connection
Darwin argued in 1872 that expressions are inherited from ancestors. Evolutionary psychologists extended this: each basic emotion readies body and mind for a recurring survival problem, such as fear for predators, disgust for disease and anger for bargaining. A 2008 study found the fear face widens the eyes, taking in more of the visual field, while disgust narrows the nostrils.
Who showed it and when
Darwin in England, 1872; Ekman's cross-cultural studies, 1960s–70s; John Tooby and Leda Cosmides at UC Santa Barbara, 1990; Joshua Susskind and Adam Anderson's 2008 face study in Toronto.
How solid is it?
Measured eye and nostril changes support a functional origin for some expressions, but the claim that all six are separate adaptations rests mostly on plausible reasoning.
Open questions
Whether emotions are distinct evolved programs or built from general ingredients like arousal and pleasantness; stories about the ancestral past are hard to test.
▸Evolutionary psychology proposes an origin for In-group bias and social identity (Tajfel)Mixed evidence
The connection
Evolutionary psychologists argue that for most of human history survival depended on small cooperative bands, so minds evolved to trust and help fellow members and stay wary of outsiders. On this view, favoring an arbitrary team in Tajfel's experiments reflects a quick 'us versus them' instinct firing on minimal cues.
Who showed it and when
Developed from the 1990s by Leda Cosmides, John Tooby and others; a 2001 study with Robert Kurzban suggested people track coalitions, not just race.
How solid is it?
In-group favoritism appears early in childhood and across cultures, and coalition cues can override racial categorization. But the evolutionary origin is inferred, not directly observed.
Open questions
Critics say culture and learning could explain the same patterns, and that 'just-so' stories about ancestral life are hard to test.
▸Attachment theory (John Bowlby) drew on evolution, anticipating Evolutionary psychologyWell replicated
The connection
Bowlby argued that a baby's bond to its caregiver is an evolved system that kept infants close to protectors when predators were a real threat. He drew on animal-behavior research such as Lorenz's imprinting and Harlow's monkeys, and coined 'environment of evolutionary adaptedness', a term evolutionary psychology later adopted.
Who showed it and when
London's Tavistock Clinic, 1958–1969, culminating in Bowlby's book Attachment (1969); evolutionary psychologists took up his term in the late 1980s and 1990s.
The evidence
Bowlby's books spell out the evolutionary reasoning, and Tooby and Cosmides adopted and credited his term.
Open questions
Whether different attachment styles are evolved strategies tuned to harsh or safe environments, as some life-history theorists propose, remains debated.