Pre-task instructions have been a neglected source of motivation in vigilance. In the present study, 32 Ss monitored a complex visual vigilance display for 40 min. with a signal rate of 60/hr. 16 Ss were told that such tasks are usually challenging (positive set) and 16 were told such tasks are usually monotonous (negative set). Performance was significantly better throughout the session by Ss with the positive set and decrements did not occur with either group. The results indicate the importance of motivational factors in vigilance. Implications for vigilance research are discussed.
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