Kakizaki T
Eur J Appl Physiol Occup Physiol. 1985;54(5):466-70. doi: 10.1007/BF00422953.
Occipital midline beta-2 (Oz beta 2) amplitudes and subjective ratings of task difficulty were measured in 24 healthy male students, aged 19-23 years, performing four kinds of mental task (transcribing, cancelling, adding, and calculating) at two grades of self-pace (maximum workload and moderate workload) for 5 min each. Significant differences in Oz beta 2 amplitudes were observed between the tasks at either workload, except between the adding task and the calculating task. However no significant difference in the subjective ratings was observed between the tasks at either workload, except between the adding task and the calculating task or the cancelling task at maximum workload. Thus the Oz beta 2 amplitude was more sensitive to differentiation of task strain between the mental tasks, than the subjective rating. In comparison with the critical levels deduced previously, it was estimated from the Oz beta 2 amplitudes that all the tasks at either workload could induce heavy task strain in the subject, except for the cancelling task at moderate workload. From the subjective ratings, however, it was estimated that no task could induce heavy task strain in the subject. It was, moreover, suggested that the Oz beta 2 amplitudes reflected the difference in the quality of cortical functions and that the subjective ratings of task difficulty were associated with time pressure rather than the quality of cortical functions.
对24名年龄在19至23岁之间的健康男性学生进行了枕部中线β-2（Oz β2）振幅和任务难度主观评分的测量。这些学生以两种自我节奏等级（最大工作量和中等工作量）执行四种心理任务（抄写、删除、加法和计算），每种任务持续5分钟。在任一工作量下，除加法任务和计算任务之间外，各任务之间的Oz β2振幅均存在显著差异。然而，在任一工作量下，除最大工作量时的加法任务与计算任务或删除任务之间外，各任务之间的主观评分均未观察到显著差异。因此，Oz β2振幅比主观评分对心理任务之间的任务压力差异更敏感。与先前推导的临界水平相比，根据Oz β2振幅估计，除中等工作量下的删除任务外，任一工作量下的所有任务都可能在受试者中诱发重度任务压力。然而，从主观评分来看，估计没有任务会在受试者中诱发重度任务压力。此外，提示Oz β2振幅反映了皮质功能质量的差异，任务难度的主观评分与时间压力有关，而不是与皮质功能质量有关。
