Abstract
Four groups of 10 Sprague-Dawley albino rats were trained in a runway under different conditions of drive and reward during acquisition and extinction. A significant difference was found between the high-drive-high-reward and high-drive-low-reward groups in the acquistion and extinction phases. Extinction was faster for the high-drive-high-reward group, which reached significantly higher asymptote during acquistion. The results supported Spence''s prediction concerning the role of incentive in the extinction process.

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