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658 bytes added ,  14:06, 12 March 2007
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==Decrease in Neural or Behavioral Responses with repeated presentation of a stimulus==

'''Habituation''' decrease in behavioral response

'''Adaptation''' decrease in sensory receptor or neural response

'''Desensitization''' decrease response by gradual repeated exposure to stimulus

'''Drug Toleranc'''e response decreases so that larger doses are required to achieve the same effect

'''Tachyphylaxis''' rapid development of drug tolerance

==Decrease in Learned Responses==

'''Extinction''' repeated presentation of CS without presentation of the US

'''Forgetting''' passage of time without presentation of the conditioned or unconditioned stimuli

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