Coupling Effects and Performance in Viligance Tasks

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Abstract
The performance of 32 subjects on 90-min. auditory and visual vigilance tasks were measured in conventional and theory of signal detection indices as a function of “coupling,” sense mode, and time on task. Order effects, correlations between sense modes, and possible effects of observing responses were also examined. Regardless of the coupling condition or sense mode involved, β increased while hits and false alarms decreased as time on task increased. There was no significant decline in d' over time on task for either sense mode or coupling conditions. In general, conventional measures of performance were similar for the auditory and visual tasks. Significant cross-modality correlations were obtained for false alarms, latency, and β values. No order effects were observed. The results are discussed in terms of expectancy theory and an observing response model.

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