Kinugasa T, Fukuda K, Nakamura R, Hosokawa T
College of Medical Technology and Nursing, University of Tsukuba, Ibaraki, Japan.
Percept Mot Skills. 1988 Apr;66(2):515-20. doi: 10.2466/pms.1988.66.2.515.
Electromyographic reaction times (EMG-RTs) of the right biceps brachii muscle were examined for two movement patterns, elbow flexion and forearm supination, in 8 healthy male subjects under simple and complex RT conditions with varied preparatory intervals (PIs): 0, 200, 400, 600, and 800 msec. In the simple RT condition, the subject was informed of the movement patterns to be performed prior to beginning the trials. In the complex RT condition the subject had to choose one of the two movement patterns at the time of the presentation of a warning signal. The results indicated that: (1) compared with the simple RT condition a delay of about 100 msec. in over-all mean EMG-RT was observed at PI = 0 msec. in the complex RT condition; (2) the difference of over-all mean EMG-RT between the two RT conditions disappeared when PI = 400 msec.; and (3) the difference in EMG-RTs between flexion and supination in the complex RT condition became the same as that in the simple RT condition when PI = 700 msec. It is assumed that the preparatory set for response movements is organized in an order, resulting in the differentiation of RT.
在简单反应时和复杂反应时条件下，对8名健康男性受试者的右侧肱二头肌进行肌电图反应时（EMG-RT）检测，反应时条件包括不同的准备间隔（PI）：0、200、400、600和800毫秒，运动模式为两种：屈肘和前臂旋后。在简单反应时条件下，受试者在开始试验前被告知要执行的运动模式。在复杂反应时条件下，受试者必须在出现警告信号时从两种运动模式中选择一种。结果表明：（1）与简单反应时条件相比，在复杂反应时条件下，当PI = 0毫秒时，整体平均EMG-RT延迟约100毫秒；（2）当PI = 400毫秒时，两种反应时条件下的整体平均EMG-RT差异消失；（3）当PI = 700毫秒时，复杂反应时条件下屈肘和旋后之间的EMG-RT差异与简单反应时条件下相同。据推测，反应运动的准备定势是按顺序组织的，从而导致反应时的差异。
