The effects of stimuli associated with shock onset or termination on restraint-induced gastric lesions

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Rats under physical restraint were presented a CS that was previously paired with either shock onset or electric shock termination, or at random intervals before and after shock onset (control). The group exposed to the CS previously paired with shock onset had significantly more gastric lesions than did the other two groups, which did not differ. These results support the findings of studies which measured an instrumental response in showing that the effects of a CS associated with shock onset were different from the effects of a CS previously paired with shock termination.