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Abstract

A curvilinear relationship between extraversion and performance on an operant task for retarded adults was hypothesized. Following previous research with subjects with disturbed cognitive processes, the curve was hypothesized to be opposite from the usual Yerkes-Dodson relationship. The Eysenck-Withers Personality Inventory Extraversion scale was orally administered to 20 adult retardates. These subjects were then required to push a button on either the left or right side for M&M candies. The side that was reinforced changed five times. The number of errors made after the changes indicated the quality of performance. A significant curvilinear relationship between extraversion and errors was found, with moderately introverted subjects making more errors than either extremely introverted or extraverted subjects.

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A Curvilinear Relationship between Extraversion and Performance for Adult Retardates

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