Utility of the group coefficient of variation in predicting speech-motor equivalence in normal and articulatory disordered speakers.
Coefficients of variation of EMG signals from the orbicularis oris superior, orbicularis oris inferior, and masseter muscles of normal 4- and 8-yr.-olds and adults and of articulatory disordered 8-yr.-olds suggests that development of speech motor equivalence is individualized, muscle-dependent, and affects all children. Age-related differences were noted. Group data did not predict individual values.
D000367:Age Factors; D001184:Articulation Disorders / Q000503:physiopathology*; D002648:Child; D002675:Child, Preschool; D004576:Electromyography; D005152:Facial Muscles / Q000503:physiopathology*; D006801:Humans; D008406:Masseter Muscle / Q000503:physiopathology*; D008410:Masticatory Muscles / Q000503:physiopathology*