Abstract
Female rats were either handled, shocked, or unmanipulated during the pre- or immediate postweaning period. At maturity they were observed in a one-trial avoidance situation. On the single conditioning trial, they were shocked for 1 sec or until they returned to the elevated starting platform. Thereafter, one nonshock trial per day was given for 21 days. Under the “1 sec shock” procedure, response latencies were influenced by the type of prior manipulation and the age at which it was experienced, with animals shocked during the postweaning period showing the longest latencies. Under the “variable shock” procedure, all previously manipulated groups had longer latencies than the controls.
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