Abstract
Sixty-three rats were divided in equal numbers, such that one group received a series of 10 ECS treatments paired with a light CS, a second group received 10 unpaired ECS treatments, and a third received no ECS. Seven Ss in each group were then assigned to one of three CS conditions (light CS, tone CS, no CS) for purposes of avoidance conditioning. The results showed that ECS groups failed to show normal weight gain, while exhibiting greater amounts of urination and defecation during treatment. ECS-treated Ss also required a greater number of trials to reach criterion on the avoidance problem, an effect which was not related to specific CS pairings. It was concluded that the stressful effects of ECS were persistent and disruptive enough to restrict new learning in an aversive situation.
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