Effect of Three Kinds of Knowledge-Of-Results Information on Three Measures of Vigilance Performance

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Abstract
Tea Ss in each of 8 groups individually performed a watchkeeping task of 1 hr. duration. Each group was presented one of the 8 factorial combinations of the presence (or absence) of 3 different kinds of knowledge of results (KR), i.e., KR regarding missed signals, correctly detected signals, and false responses. The results indicated that KR regarding missed signals produced a significant decrease in the total number of false responses, and that KR regarding correct detections produced a significant decrease in the proportion of missed signals. When KR regarding false responses was given, there was both a significant increase in reaction time to correct detections and a significant decrease in the number of false responses. In short, the effect of providing a specific type of information in a watchkeeping task appears to be specific to the measure of performance efficiency employed. A discussion is included of the interpretation of these results.

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