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Just as evolutionary physiology has worked to identify physical adaptations of the body that represent "human physiological nature," evolutionary psychology works to identify evolved emotional and cognitive adaptations that represent "human psychological nature."
According to evolutionary psychology, the brain has evolved specialized neural mechanisms that were designed for solving problems that recurred over evolutionary time.
Evolutionary psychologists hypothesize that humans have inherited special mental capacities for adaptations such as acquiring language, inferring others' emotions, discerning kin from non-kin, identifying healthier mates, and cooperating with others.
Evolutionary psychology (EP) is an approach in the social and natural sciences that examines psychological traits such as memory, perception, and language from a modern evolutionary perspective.
It seeks to identify which human psychological traits are evolved adaptations – that is, the functional products of natural selection.
For instance, evolutionary biology researches the human body (such as the heart, lungs, or immune system) and how it adapts over time.
Evolutionary psychology applies this same thinking to psychology, arguing that much of human behavior is the result of psychological adaptations that evolved to solve recurrent problems in human ancestral environments.
History of the evolutionary perspective
Evolutionary psychology has its historical roots in Charles Darwin's theory of natural selection .
Two of Darwin's books examined animal emotions and psychology, and his theories of evolution, adaptation, and natural selection have provided insight into why the brain functions the way it does.
Evolutionary biology emerged as an academic discipline in the 1930s and 1940s, along with the study of animal behavior (ethology).
In 1975 Edward O. Wilson combined evolutionary theory with studies of animal and social behavior in his book Sociobiology: The New Synthesis.
Evolutionary psychology was influenced by both ethology and evolutionary biology, but also draws on cognitive psychology, behavioral ecology, artificial intelligence, genetics, anthropology, archaeology, biology, and zoology.
Fields that are closely related include animal behavioral ecology, human behavioral ecology, dual inheritance theory, and sociobiology.
Though the term evolutionary psychology was most likely coined by American biologist Michael Ghiselin in 1973, it wasn't until 1992 that the term was popularized by Jerome Barkow, Leda Cosmides and John Tooby in their highly influential book The Adapted Mind: Evolutionary Psychology and The Generation of Culture.
Proponents of evolutionary psychology suggest that it seeks to bridge the division between the "soft" human social sciences (such as psychology and sociology) and the "hard" natural sciences (such as chemistry and physics).
They argue that the psychology of human beings should be understood as a branch of biology, since humans are living organisms.
Just as evolutionary physiology has worked to identify physical adaptations of the body that represent "human physiological nature," evolutionary psychology works to identify evolved emotional and cognitive adaptations that represent "human psychological nature. "
Evolutionary psychology is founded on several core premises:
The brain is an information processing device, and it produces behavior in response to external and internal inputs.
The brain's adaptive mechanisms were shaped by natural and sexual selection.
Different neural mechanisms are specialized for solving problems in humanity's evolutionary past.
The brain has evolved specialized neural mechanisms that were designed for solving problems that recurred over evolutionary time, giving modern humans stone-age minds.
Most contents and processes of the brain are unconscious; and most mental problems that seem easy to solve are actually extremely difficult problems that are solved unconsciously by complicated neural mechanisms.
Human psychology consists of many specialized mechanisms, each sensitive to different classes of information or inputs.
These mechanisms combine to produce manifest, observable behavior.
Evolutionary psychologists hypothesize, for example, that humans have inherited special mental capacities for acquiring language, making this process nearly automatic.
Other adaptations might include the abilities to infer others' emotions, to discern kin from non-kin, to identify and prefer healthier mates, to cooperate with others, and so on.
Consistent with the theory of natural selection, evolutionary psychology sees organisms as often in conflict with others of their species, including mates and relatives.
For example, mother mammals and their young offspring sometimes struggle over weaning, which benefits the mother more than the child.
Evolutionary psychology has been applied to the study of many fields, including economics, aggression, law, psychiatry, politics, literature, and sex.
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