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extinction
(redirected from Extinctions)

    Also found in: Dictionary/thesaurus, Legal, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
extinction /ex·tinc·tion/ (eks-tink´shun) in psychology, the disappearance of a conditioned response as a result of nonreinforcement; also, the process by which the disappearance is accomplished.
ex·tinc·tion (k-stngkshn)
n.
Progressive reduction in the strength of the conditioned response in successive conditioning trials during which only the conditioned stimulus is presented and the unconditioned stimulus is omitted. See absorbance.
extinction
[iksting′shən]
a state of being lost or destroyed.
extinction
the disappearance of a conditioned response as a result of nonreinforcement.
extinction
Psychiatry A facet of operant–classical conditioning, in which the conditioned response is weakened and eventually disappears by nonreinforcement. See Operant conditioning, Respondent conditioning, Sensory extinction.


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McGavin is the Acting Curator of Entomology at Oxford University's Museum of Natural History and has researched the world on the topic--so drawing upon his considerable expertise, ENDANGERED is more than a simple rehash of extinction theory as he deftly examines the different types and scales of extinctions and their consequences.
Endangered by Internet Bookwatch
McGavin is the Acting Curator of Entomology at Oxford University's Museum of Natural History and has researched the world on the topic--so drawing upon his considerable expertise, ENDANGERED is more than a simple rehash of extinction theory as he deftly examines the different types and scales of extinctions and their consequences.
Endangered by The Bookwatch
Those extinctions occurred at least 25,000 years before the most recent ice age began.
Going under down under: early people at fault in Australian ... by Perkins, S. / Science News
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