Supplementary report: Monetary incentive and motivation in discrimination learning--sex differences.

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Abstract
Miller and Estes (1961) found that amount of monetary reward, even in a 50 to 1 ratio, failed to improve error scores in the acquisition of a visual discrimination by 9-yr-old boys. This study provides similar comparisons for adult Ss. A 3 × 2 × 2 factorial design was used: (a) three incentive levels (knowledge of results [KOR], 1 cents, and 25 cents); (b) two n Achievement (n Ach) levels (high and low); and (c) two sex levels. The significant variables were sex (females made fewer errors) and the sex-incentive interaction. Female superiority might reasonably be attributed to cultural differences between sexes in past experience and training since the task involved attention to minute facial detail. Age differences are shown not only by lack of incentive effect for adult males, but also by the n Ach factor, significant for young boys but not for male or female adults. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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