每隔一小时测量一次参与者的客观警觉性，心理动作警觉作业测试与清醒度维持测试交换进行。
Objective alertness was measured by hourly testing, alternating the PVT with the Maintenance of Wakefulness test (MWT).
尽管在社交情况下的心理动作警觉作业（PVT）测试中的区别并不明显，内向型人比外向型人在清醒度维持测试（MWT）中表现出更为警觉。
Although differences in PVT performance were not evident during the social-exposure condition, introverts were more alert than extraverts on the MWT.
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