Motor Control Simulation Of Time Optimal Fast Movement in Man
In the fastest human movements, three pulses of activation can be recorded from the agonist and antagonist muscles in the form of bursts of the electromyogram, (EMG). Our detailed simulation of the muscles and load enabled quantitative determination of the Action, Braking, and Clamping roles of the first agonist, antagonist, and second agonist bursts respectively. These results are obtained by varying EMG based control signal inputs to a fixed sixth order non-linear model of horizontal head rotation. In an additional simulation experiment it is shown that a three pulse control signal is required for optimal movement when the movement is constrained to a small target window beginning soon after movement start. Similarly, experimental variations in time optimal movements obtained by application of external loads, or alteration of proprioception by tendon vibration can be accurately simulated with the same unchanged model but with changed experimental conditions and an input control signal which is changed by the same amount as observed EMG changes.
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