Abstract
The peak amplitude of EMG activity was measured from the orbicularis oris superior (OOS), orbicularis oris inferior (OOI), and masseter muscles of a cleft-palate child and compared to data obtained from a normal child. Both children evidenced similar levels of average peak EMG activity and variability of performance across the three muscles. These data were interpreted to suggest that limitations in the function of the OOS, OOI, and masseter muscles do not contribute to the articulatory anomalies exhibited by the cleft-palate child.
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