MODULATION OF CUTANEOUS CORTICAL EVOKED-POTENTIALS DURING ISOMETRIC AND ISOTONIC CONTRACTIONS IN THE MONKEY
MODULATION OF CUTANEOUS CORTICAL EVOKED-POTENTIALS DURING ISOMETRIC AND ISOTONIC CONTRACTIONS IN THE MONKEY
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DOI：
10.1016/0006-8993(90)90010-9
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发表时间：
1990-12-17
期刊：
影响因子：
2.9
通讯作者：
CHAPMAN, CE
中科院分区：
文献类型：
--
作者：
JIANG, W;LAMARRE, Y;CHAPMAN, CE
在一只猴子中研究了运动方向（屈曲与伸展）和运动任务性质（等张与等长）对皮肤刺激的感觉皮层诱发反应调制的影响。 通过测量在初级躯体感觉皮层中的区域3b和1的臂代表中记录的空气抽吸诱发电位的短潜伏期分量的幅度来评估感觉反应。 在大多数记录站点，它被发现，在一个非特异性的方式由运动活动的吹气诱发电位的幅度降低。 调制的时间和深度都不随收缩的方向或类型而变化。 这种影响是广泛的，因为几乎整个前肢（多毛的皮肤）的输入在运动任务中减少了。 因此，这些结果表明，调制更紧密地联系在一起的中央电机输出比肌肉力量和/或肢体位移产生的外周输入。 有人建议，来自中央电机结构的信号，以前馈的方式行事，在运动过程中的“门控”皮肤输入发挥了重要作用。 它进一步表明，中央介导的影响是通过一个最终的共同途径上的“门控”信号收敛。
The effects of the direction of movement (flexion vs extension) and the nature of the motor task (isotonic vs isometric) on the modulation of sensory cortical evoked responses to cutaneous stimulation were investigated in one monkey. Sensory responses were assessed by measuring the magnitude of the short latency component of air puff-evoked potentials recorded intracortically in the arm representation of areas 3b and 1 in the primary somatosensory cortex. At most recording sites, it was found that the amplitude of the air puff-evoked potential was decreased in a non-specific manner by motor activity. Neither the timing nor the depth of the modulation were found to vary with either the direction or the type of contraction. The effects were widespread since inputs from practically the entire forelimb (hairy skin) were diminished during the motor tasks. These results thus show that the modulation was more closely linked to the central motor output than to the peripheral input generated by muscle force and/or limb displacement. It is suggested that signals originating from central motor structures, acting in a feedforward manner, play a major role in 'gating' cutaneous inputs during movement. It is further suggested that the centrally mediated effects are exerted via a final common pathway upon which the 'gating' signals converge.