Simulator experiments were conducted to evaluate the effects of alcohol intoxication on task performance. Nineteen graduate school students participated in the experiments. Their measured performance in a simple reaction time task showed no significant differences between sober and intoxicated conditions. On the other hand, their measured performance in cognitive multiple tasks performed on the simulator, Multi-Attribute Task Battery (MATB), showed significant differences among the intoxicated conditions. The scores of an MATB tracking task in particular indicated a noticeable decline in performance. These results suggest that the effects of alcohol tended to appear in a multi-task situation and that the tracking task, resembling vehicle lane-keeping, was easily affected by alcohol intoxication.
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