Nishihira Y, Araki H, Ishihara A
Department of General Education, School of Allied Medical Sciences, Nagasaki University, Japan.
Electromyogr Clin Neurophysiol. 1991 Jan-Feb;31(1):15-20.
We investigated the changes in the somatosensory evoked potentials (SEPs) and particularly which components of the SEPs altered immediately after rapid reaction movements. N20, P23, N35, and P45 components measured over the scalp were all attenuated except for the P45 component measured at CZ. Particularly, the N20 and P23 components were markedly attenuated at both C3' and CZ immediately following rapid reaction movements. N18 and N20 components are thought to represent thalamocortical and primary sensory cortex activities. Therefore, the present results suggest that following rapid reaction movements, the thalamocortical and primary sensory activities are significantly attenuated. Moreover, following rapid reaction movements, the onset of EMG activity preceded the afferent discharge of the muscle spindle. Therefore, it may be concluded that central factors were principally responsible for the attenuation of the SEPs immediately following rapid reaction movements.
我们研究了体感诱发电位（SEP）的变化，特别是在快速反应运动后哪些SEP成分会立即改变。在头皮上测量的N20、P23、N35和P45成分均减弱，但在Cz处测量的P45成分除外。特别是，快速反应运动后，C3'和Cz处的N20和P23成分均显著减弱。N18和N20成分被认为代表丘脑皮质和初级感觉皮质活动。因此，目前的结果表明，快速反应运动后，丘脑皮质和初级感觉活动显著减弱。此外，快速反应运动后，肌电图活动的起始先于肌梭的传入放电。因此，可以得出结论，中枢因素主要是快速反应运动后SEP减弱的原因。
