Abstract
The interaction between the voluntary direct motor control system and the follow-up postural motor control system is examined in normal human subjects. The state of the alpha motoneuron pool is measured by eliciting a Hoffmann reflex while a subject is making a voluntary movement. A digital process computer is used on-line for the control of the experiment and for data recording and analysis. It is proposed that the control signals for the voluntary movements studied appear directly at the alpha motoneuron where they exert an influence over the muscle activity which is independent of the Ia feedback. Simultaneously, some descending control signals exert a presynaptic influence on the Ia terminals, which permit regulation of the excitability of the monosynaptic pathway independently of the alpha motoneuron activity.
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