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Rat HR conditioning at longer ISIs warrants clinical caution; extends temporal gradient theory but leaves translation open.
Classical aversive conditioning of heart rate in rats was studied using a 2 × 6 factorial design involving comparisons of trace and delayed conditioning procedures and six CS-US intervals (.0, .1, .3, .5, 1.0, and 6.0 sec.). Positive evidence of decelerative HR CRs was obtained at the .5, 1.0 and 6.0 ISIs, with maximum conditioning occurring at the 6.0 value. The results supported a modified version of the temporal gradient of reinforcement theory of classical conditioning. Problems relating to the separation of true CRs from nonassociative reactions to the CS were also discussed.
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Fitzgerald et al. (1971) studied this question.
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