Monitoring of Complex Visual Displays: III. Effects of Repeated Sessions on Human Vigilance

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Abstract
A vigilance experiment was performed using a visual monitoring task with multiple stimulus sources. Under investigation were effects of repeated sessions on monitoring behavior. Nine 3-hour sessions were given on consecutive days. Following a longer 7-day interval, a 10th session was given. The main findings were a significant decrement in detection latency within each session, but no statistically reliable evidence for a between-sessions effect. Evidence was presented to suggest that the spatial configuration of stimulus sources was a factor for vigilance decrement because efficiency of the observing response decreased as a function of observation time.

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