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A species difference in conditioned emotional response

, : A species difference in conditioned emotional response. Psychol Rep 15(2): 579-585

A technique to produce a quantitative measure of CER [conditioned emotional response] without pretraining is presented. The response, a change in S's exploratory activity during the CS (conditioned stimulus), occurs rapidly in even 3-wk. old rats and mice. Species differences occur in the reaction to CS, US, [unconditioned stimulus], and CS-US pairings. Although rats tend to suppress activity during CS as a result of CS-US pairings, the shock or buzzer alone increases activity level; while the opposite is true of mice.


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