Descending motor command to prime mover of dependent finger induces tactile gating in target and distant non-target finger.

Hitoshi Oda, Ryo Tsujinaka, Shiho Fukuda, Naoki Hamada, Masakazu Matsuoka, Koichi Hiraoka
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Abstract

This study examined whether tactile gating induced by the descending motor command to one finger spreads out to the other fingers to which the command is not delivered and whether this gating is dependent on the target finger to which the command is delivered. The change in perceptual threshold to the digital nerve stimulation of one finger induced by tonic contraction of the first dorsal interosseous or abductor digiti minimi muscle was examined. The perceptual threshold to the digital nerve stimulation of the thumb or little finger was increased by tonic contraction of the abductor digiti minimi muscle. This finding indicates that the descending motor command to the prime mover of the little finger abduction induces tactile gating not only in the finger to which the command is delivered but also in the other finger to which the command is not delivered. Tonic contraction of the first dorsal interosseous muscle did not change the perceptual threshold to the digital nerve stimulation in any finger. This finding means that tactile gating occurs particularly when the descending motor command is delivered to the dependent finger. Spreading out of tactile gating of one finger, to which the descending motor command is not delivered, is likely mediated by surround inhibition.

向依附手指的原动者发出下行运动指令会诱发目标手指和远处非目标手指的触觉选通。
本研究探讨了一个手指的下行运动指令所诱发的触觉门控是否会扩散到未发出指令的其他手指,以及这种门控是否取决于发出指令的目标手指。研究了第一背侧骨间肌或小臂内收肌的强直性收缩诱发的单指数字神经刺激感知阈值的变化。小指内收肌的强直性收缩提高了拇指或小指数字神经刺激的感知阈值。这一发现表明,对小指外展的原动力发出的下行运动指令不仅会在发出指令的手指上引起触觉门控,也会在未发出指令的其他手指上引起触觉门控。第一背侧骨间肌的强直性收缩不会改变任何手指对数字神经刺激的感知阈值。这一发现说明,触觉门控尤其发生在向依附手指发出下降运动指令时。如果降序运动指令没有传递到一个手指,则该手指的触觉门控扩散可能是由环绕抑制介导的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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