Dictionary of Human Evolution and Biology

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1. condition in which an animal becomes unafraid of an object or individual in its environment to the point that it can be ignored. For example, a human observer nearby may initially elicit fear in a primate, but over repeated occurrences, the animal loes its fear and ignores the observer.

2. in adaptation physiology, the gradual reduction of perception of and/or responses to repeated stimulation. Verb: to habituate.

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