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概要

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Ship maneuvering includes human monitoring performance which demands sustained attention, i.e., vigilance. On an ocean voyage navigators are required to respond targets with rare appearance. The present study investigated the effects of extremely low frequency of appearance of targets on visual vigilance tasks. 45 subjects were required to respond visual target signal on the CRT with one hand. A 5 (interstimulus interval : ISI) ×3 (secondary tasks) analysis of variance with repeated measures was performed on the response times. Two main effects were significant, but interactive effect nonsignificant. Secondary tasks consist of visual task or auditory task. While subjects wait for appearance of target, they were required to read letters (visual secondary task) or to shadow auditory letter (auditory secondary task). Reaction times were slower and error rates were higher when ISI of targets was longer. It suggested that long waiting-time makes vigilance decrement. In visual secondary task condition vigilance decrement was remarkable, conversely in auditory task condition it was the same level as in the control condition without secondary tasks. Auditory tasks during ship maneuvering might make no effects on sustained attention.
社団法人日本航海学会の論文
1992-09-25