Kakizaki T
Eur J Appl Physiol Occup Physiol. 1987;56(2):163-8. doi: 10.1007/BF00640640.
Three measures of mental task strain, namely performance level, occipital midline beta-2 (Oz beta 2) amplitude and subjective rating of task difficulty, were taken in 34 healthy male students aged 19-24 years as they performed either a paced or a self-paced calculating task for 4 h. The performance levels were so constant throughout the work periods that they were of no use in evaluating mental task strain. The Oz beta 2 amplitudes increased significantly with the execution of both tasks, and a significant increase took place during the self-paced task work periods. From this, a critical value of Oz beta 2 amplitude for a heavy task strain was estimated to be about 3.5 microV (the difference between the values at work and at rest). The subjective ratings of task difficulty rose linearly with work time in both tasks. The subjective task strain attributable to work time was found to exceed the critical level long before the objective measure. In addition, other results suggest that the Oz beta 2 activity attributable to task execution is related to the capacity for achieving the task.
对34名年龄在19至24岁之间的健康男学生进行了三项心理任务压力测量，即表现水平、枕叶中线β-2（Oz β2）振幅和任务难度主观评分。在他们进行4小时的限时或自定进度计算任务时进行了这些测量。在整个工作期间，表现水平非常稳定，以至于在评估心理任务压力方面毫无用处。两项任务执行过程中，Oz β2振幅均显著增加，且在自定进度任务工作期间出现了显著增加。据此，估计繁重任务压力下Oz β2振幅的临界值约为3.5微伏（工作时与休息时的值之差）。两项任务中，任务难度主观评分均随工作时间呈线性上升。发现工作时间导致的主观任务压力早在客观测量之前就超过了临界水平。此外，其他结果表明，任务执行导致的Oz β2活动与完成任务的能力有关。
