文章基本信息

标题：Transient Lowering of Mental Activity during Performance of a Mental Task
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作者：Toshio KAKIZAKI
期刊名称：Industrial Health
印刷版ISSN：0019-8366
电子版ISSN：1880-8026
出版年度：1990
卷号：28
期号：2
页码：85-96
DOI：10.2486/indhealth.28.85
出版社：National Institute of Occupational Safety and Health
摘要：To objectively detect the lowering in mental activity during mental tasks, twenty-five male students were given the calculating tasks of adding or subtracting two 2-digit numbers at three grades of task load for 1 hr each. At any task load there was little variation in the percentage of correct responses in successive 5-min periods. There was no difference among the three task loads in the mood states of stress or arousal rated at the end of the task. Among the six bands in eight leads the amplitude of the beta-2 band in the Oz-A₁ lead (0zβ₂) showed the greatest fall corresponding to a drowsy state in one subject. It was judged from this pattern that mental activity might decrease sporadically in half of the subjects, irrespective of the task load. The mean Ozβ₂ amplitudes for all the task loads decreased with work time.
关键词：Key words: Mental activity-Drowsiness-EEG (Ozβ2) amplitude-Calculating task