Abstract
Rats were trained to leverpress under a free operant avoidance schedule, and signaled response-independent shock (CS-US) was superimposed on avoidance-maintained behavior. Over the experiment, subjects received each of five US durations in a within-subjects Latin squares design: US durations were equal to (.5 sec), shorter than (.25 or.38 sec), and greater than (.75 or 1 sec) avoidable shock. Two subjects initially receiving a short US showed enhanced avoidance during the preshock CS. Subjects initially given a US equal to or longer than avoidable shock showed suppressed avoidance in CS. The control of the CS over avoidance was acquired in the first block of CS-US sessions and was maintained over the experiment irrespective of subsequent changes in US duration.
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