Stimulus varibles in vigilance: Signal duration and intensity

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Abstract
Vigilance behaviour was studied to evaluate the ability to detect short, low‐intensity, aperiodically presented auditory stimuli over a period of 80 mins. continuous watchkeeping. Four values of signal duration and of signal intensity were employed to assess the effect of each on signal detection efficiency. Results showed that both signal duration and signal intensity contributed significantly to the efficiency of signal detection over time, and that there were no differential effects of signal duration or intensity over time; that the detectability measure of a signal for stimuli above threshold level rose as both signal duration and signal intensity were increased; and that the intersignal interval did not influence the efficiency of signal detection. There was a significant decrement in detection performance over time. The model put forward by Egan, Greenberg & Schulman extending signal detection theory to a vigilance situation was validated with portion of the experimental data.

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