IN EXP. I, FOLLOWING FOOD TRAINING IN AN ALLEY, SS WERE FORWARD CONDITIONED (FC), BACKWARD CONDITIONED, OR PRESENTED SHOCK OR BUZZER ONLY IN A CHAMBER WHICH RESTRICTED BODY MOVEMENTS. IN THE PRESENCE OF CS, FOLLOWING RETRAINING, FC SS RAN SLOWER, REVERSED FORWARD LOCOMOTION MORE FREQUENTLY, AND EXHIBITED LOWER BASAL SKIN RESISTANCE LEVELS (BRL) THAN CONTROLS. IN EXP. II, CONDITIONING INVOLVED PRESENTATION OF AN EQUAL NUMBER OF HIGH AND LOW UCSS TO 2 GROUPS. FOR CS-HIGH, THE CS WAS PAIRED WITH THE STRONG UCS, AND, FOR CS-LOW, WITH THE WEAKER SHOCK. WHEN TESTED, THE CS-HIGH GROUP EXHIBITED GREATER SUPPRESSION THAN CS-LOW SS, AND BOTH EXHIBITED MORE FEAR THAN APPROPRIATE CONTROLS. BRL CHANGES REFLECTED THESE BEHAVIORAL DIFFERENCES. (17 REF.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)