Habituation
Decrease in a behavioral response to a repeated stimulus / From Wikipedia, the free encyclopedia
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Habituation is a form of non-associative learning in which a non-reinforced response to a stimulus decreases after repeated or prolonged presentations of that stimulus.[1] For example, organisms may habituate to repeated sudden loud noises when they learn these have no consequences.[2]
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Responses that habituate include those that involve the entire organism or those that involve only biological component systems of the organism. The broad ubiquity of habituation across all forms of life has resulted in it being called "the simplest, most universal form of learning...as fundamental a characteristic of life as DNA."[3] Functionally-speaking, by diminishing the response to an inconsequential stimulus, habituation is thought to free up cognitive resources to other stimuli that are associated with biologically important events.
A progressive decline of a behavior in a habituation procedure may also reflect nonspecific effects such as fatigue, which must be ruled out when the interest is in habituation.[4] Habituation is relevant in psychiatry and psychopathology, as a number of neuropsychiatric conditions, including autism, schizophrenia, migraine, and Tourette's, show reductions in habituation to a variety of stimulus-types both simple and complex.[5]