Kakizaki T
Ind Health. 1989;27(3):101-9. doi: 10.2486/indhealth.27.101.
Twenty-four healthy male clerical workers (50-59 years of age) in an automobile manufacturing plant performed as accurately as they could a calculating task consisting of the addition or subtraction of two 2-digit numbers at five grades of task load for 5 min each. The workers' work capacities were inferior in speed but not in precision to those of male students determined previously. The resting levels of occipital midline beta-2 (Oz beta 2) amplitude were significantly lower for the workers than for the students. The workers' mental workloads were objectively shown to be lighter than the students' based on a significant difference between the percent increases in Oz beta 2 amplitude over resting levels. The workers' subjective mental workloads assessed by subjective rating of task difficulty (SRTD) were lighter than the students' at higher task loads. From the trend that there was no undue rise in either SRTD or percent increase in Oz beta 2 amplitude, it was judged that no task load could induce excessive mental workload on workers.
一家汽车制造厂的24名健康男性文职人员（年龄在50至59岁之间），在五个任务负荷等级下，每次5分钟，尽可能准确地完成一项由两个两位数加减法组成的计算任务。这些工人的工作能力在速度上低于先前测定的男学生，但在精度上并不逊色。工人枕叶中线β-2（Oz β2）振幅的静息水平显著低于学生。基于Oz β2振幅相对于静息水平的百分比增加之间的显著差异，客观上表明工人的心理负荷比学生轻。在较高任务负荷下，通过任务难度主观评分（SRTD）评估的工人主观心理负荷比学生轻。从SRTD或Oz β2振幅百分比增加均未过度上升的趋势来看，判断没有任务负荷会给工人带来过度的心理负荷。
