脳は下行性運動指令をどのようにコントロールしているか? : MEPによる解析 <BRIEF REVIEW>

How Descending Motor Commands are Governed : Approach by Percutaneous Electrical and Magneto-electrical Stimulation (Motor Evoked Potentials ; MEPs)

Kasai Tatsuya

Japanese journal of sports sciences

Little is known of the extent to which perceived descending motor commands can be directed to specific motoneuron pools in normal subjects when there is no change in background afferent activity. Therefore, this brief report reviewed how subjects can direct decending motor commands to specific pools of motoneurons. To test the excitability of the relevant pools of motoneurons, percutaneous stimulation of the motor cortex (motor evoked potentials ; MEPs) was used.

A major conclusion from our most recent results and the previous reports was that subjects can learn to activate a limited group of CNS neurons in the absence any changes in peripheral feedback. Moreover, subjects can learn to fractionate subthreshold descending motor commands to intrinsic muscles without recourse to afferent feedback. It may be that this ability is of importance in the learning and control of fine manipulative behavior which is so characteritsic of the human voluntary movement.

Sports and physical training [ 780 ]

jpn

日本バイオメカニクス学会

[ISSN] 0286-9322

[NCID] AN00388432