Auditory Feedback and Conditioning of the Single Motor Unit.
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
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The effects of direct auditory feedback of the electromyogram EMG on learning to control a single motor unit SMU were investigated. Seventeen human subjects were injected with bipolar fine-wire electrodes into the tibialis anterior muscle. A trial light indicated the onset of a trial. If the subject activated an SMU, a correct light appeared. A non-SMU response was followed by an incorrect light. All subjects received an initial training series with auditory EMG feedback followed by a retest at 2 weeks without EMG feedback. Speed of initial learning was substantially improved by direct EMG feedback. The nature and amount of learning, including the ability to use proprioceptive cues in controlling an SMU, were not affected, nor was retention of learning. Author