Based on previous comparative research inconsistency in the rotary pursuit performance of 30 normals and 30 retardates, the present study manipulated knowledge of results across two intellectual levels. Significant effects of IQ, trials, and incentive and several interesting significant interactions were found. Normals increased their performance efficiency over retardates' as trials progressed. Ss at both intellectual levels, when provided incentives, increased their performance over that of similar groups without incentive as trials progressed. And, an IQ × Incentive trend was found, with educable retardates appearing to profit more from incentive than normals.
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