Abstract

Purpose

This study determined the cortical areas contributing to the process of the reaction time (RT), movement time, onset-peak time, peak velocity and amplitude of the movement.

Methods

Eighteen healthy right-handed humans abducted the left index finger in response to a start cue with transcranial magnetic stimulation (TMS).

Results

There was a significant and positive correlation coefficient between the peak velocity and amplitude, indicating that movement velocity increases with the size of the movement to maintain the consistent time taken for the movement. There was no significant correlation between the RT and movement time, and thus, hypothesis that those are under common motor process was not supported. The RT in the trials with TMS over the dorsal premotor cortex, dorsolateral prefrontal cortex, or posterior parietal cortex was significantly shorter than the RT in the trials with sham TMS, indicating that those areas contribute to the motor process in the RT. The onset-peak time in the trials with TMS over the posterior parietal cortex was significantly shorter than that in the trials with sham TMS, indicating that the posterior parietal cortex contributes to the motor process that determines the time taken for the acceleration phase of the movement.

Conclusion

The findings support a view that the cortical areas both in front of and behind the primary motor cortex contribute to the motor process before the movement onset, but the areas behind the primary motor cortex particularly contributes to the motor process during the acceleration phase of the movement.

中文翻译：

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运动开始前后皮质对运动过程的贡献

摘要

目的

这项研究确定了对反应时间 (RT)、运动时间、起始峰值时间、峰值速度和运动幅度过程有贡献的皮质区域。

方法

18 名健康的惯用右手的人为了响应经颅磁刺激 (TMS) 的开始提示而绑架了左手食指。

结果

峰值速度与振幅之间存在显着的正相关系数，表明运动速度随着运动的大小而增加，以保持运动所需的时间一致。RT 和运动时间之间没有显着相关性，因此，不支持那些处于共同运动过程中的假设。在背侧前运动皮层、背外侧前额叶皮层或后顶叶皮层的 TMS 试验中，RT 明显短于假 TMS 试验中的 RT，表明这些区域有助于 RT 中的运动过程。TMS 在后顶叶皮层试验中的起始高峰时间明显短于假 TMS 试验，

结论

研究结果支持一种观点，即初级运动皮层前后的皮层区域在运动开始前对运动过程有贡献，但初级运动皮层后面的区域在运动的加速阶段对运动过程有特别贡献.