Hiraoka Koichi, Kori Chisato, Sato Kana
Department of Physical Therapy, College of Health and Human Sciences, Osaka Prefecture University, Habikino, Japan.
Neuroreport. 2017 May 24;28(8):451-456. doi: 10.1097/WNR.0000000000000784.
The aim of this study was to investigate whether the somatosensory-evoked potential (SEP) is gated and elicited earlier when a motor response to a somatosensory stimulus is faster. In healthy humans, the left index finger and thumb were pinched in response to a somatosensory stimulus administered over the left median nerve. The SEP elicited by this stimulus when producing a fast motor response was compared with that when producing a slow motor response. The amplitudes of N18 and frontal P40 when producing a fast motor response were smaller than those when producing a slow motor response. The latencies of frontal P22 and P40 when producing a fast motor response were shorter than those when producing a slow motor response. These findings indicated that the responses of the primary sensory and frontal areas elicited by a somatosensory stimulus are gated and that the responses of the frontal areas elicited by this stimulus occur earlier when a motor response to this stimulus is faster. The enhanced efficiency or increased speed of the stimulus identification process may be related to the gating and early onset of the SEP components when producing a fast motor response.
本研究的目的是调查当对体感刺激的运动反应更快时，体感诱发电位（SEP）是否会受到门控并更早地引出。在健康人类中，针对通过左正中神经施加的体感刺激，捏压左手食指和拇指。将产生快速运动反应时该刺激引出的SEP与产生缓慢运动反应时引出的SEP进行比较。产生快速运动反应时N18和额部P40的波幅小于产生缓慢运动反应时的波幅。产生快速运动反应时额部P22和P40的潜伏期短于产生缓慢运动反应时的潜伏期。这些发现表明，体感刺激引出的初级感觉区和额部区域的反应受到门控，并且当对该刺激的运动反应更快时，该刺激引出的额部区域的反应会更早发生。刺激识别过程效率的提高或速度的增加可能与产生快速运动反应时SEP成分的门控和早期出现有关。
