Abstract
Preliminary data are presented on the voluntary activation of single motor units recorded from the neck with surface electrodes. Behavioral tests support the conclusion that these motor units are from the platysma muscle, and that this muscle functions as an antagonist to the orbicularis oris inferior muscle during speech. The patterns of motor unit activation observed during simple bilabial speech movements are consistent with the size principle as well as previous studies of single motor unit activation and movement dynamics.
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