Abstract
6 male littermate rats reared from weaning in environments of either reduced or augmented stimulus variety were compared under different conditions of motivational urgency. Tests involving high urgency—initial exposure to an open field, passive (step-down) avoidance of foot-shock, and CER acquisition—showed no differences ( ps > .05). The test involving low urgency —extinction of the CER—separated the groups ( p < .01).
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3 articles.
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