The effects of several procedures for providing knowledge of results (KR) and monetary reward on performance of a visual vigilance task were investigated. 72 Ss monitored a simulated CRT for 3 hr. The independent variables were visual KR versus no visual KR, auditory KR versus no auditory KR, and performance-contingent monetary reward versus noncontingent monetary reward. Probability of detection was significantly higher for the knowledge of results conditions and for performance-contingent reward than for the respective control conditions. The most effective treatment combination was visual knowledge of results combined with performance-contingent reward.
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