Carlton L G, Carlton M J
Department of Physical Education, University of Illinois, 906 S. Goodwin, Urbana, Illinois 61801, USA.
J Mot Behav. 1987 Jun;19(2):227-39. doi: 10.1080/00222895.1987.10735409.
Examinations of the ability to rapidly modify ongoing movements have found that amendment latencies are shorter when a visual stimulus specifies an increase in movement velocity as compared to when a movement reversal is required. Our present study examined the hypothesis that amendment latencies for both continue and reverse instructions are dependent on the muscle activation state when the amendment is produced. Visual stimuli representing continue and reverse instructions wer represented at four different phases of a discrete arm movement, with amendment latencies measured to modified electromyographic (EMG) patterns. Amendment latencies for the continue instruction were shortest when the stimulus was presented early in the movement and increased when the stimulus was presented later in the response. The opposite trend was true for the reversal condition with long latencies occurring when the stimulus was presented early in the movement. Our findings support the notion that amendment latencies are directly related to the active state of the motor system when the modification is required, and the nature of the amendment to be generated.
对快速改变正在进行的动作的能力的研究发现，与需要动作反转时相比，当视觉刺激表明动作速度增加时，修正延迟更短。我们目前的研究检验了这样一个假设，即继续和反转指令的修正延迟取决于产生修正时的肌肉激活状态。代表继续和反转指令的视觉刺激在离散手臂动作的四个不同阶段呈现，同时测量对修改后的肌电图（EMG）模式的修正延迟。当刺激在动作早期呈现时，继续指令的修正延迟最短，而当刺激在反应后期呈现时，修正延迟增加。在反转条件下则呈现相反的趋势，当刺激在动作早期呈现时，延迟较长。我们的研究结果支持这样一种观点，即修正延迟与需要进行修改时运动系统的活跃状态以及要产生的修正的性质直接相关。
