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13.
Perceptual and motor effects of muscle co-activation in a force production task
Cuadra, Cristian ...
We tested several predictions of the theory of motor control with spatial referent coordinates related toeffects of muscle coactivation on force production and perception. In particular, we predicted ...that subjects wouldproduce unintentional force increase by finger flexors and be unaware of this force increase. Healthy subjectsperformed steady force production task in isometric conditions with visual feedback on the force level. Theycoactivated muscles of the arm trying to keep the force constant in the absence of visual feedback. This led toa consistent force increase not perceived by the subjects as reflected by their verbal reports. In contrast, whenasked to match the force with the contralateral hand, adequate force matching was observed. Using the %%inversepiano%apparatus confirmed no change in the referent coordinate of the fingers and an increase in its apparentstiffness. The results confirm the earlier hypothesis on the reciprocal command being hierarchically higher thanthe coactivation command. The observations suggest that verbal reports and force matching use different neuralmechanisms of force perception; the former are dominated by sense of effort, which reflects primarily the mag-nitude of the reciprocal command. There were only minor differences between the dominant and non-dominanthands, likely reflecting the faster unintentional drifts of control variables in the dominant hand.
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