Abstract
EMG recordings from selected laryngeal and supralaryngeal muscles of normal speakers were obtained during normal auditory feedback and delayed auditory feedback (DAF) conditions. The changes in muscle function were analyzed and compared to EMG recordings previously obtained from subjects who stutter. The main effect of DAF was to alter the timing of muscle activity. Prolongations and repetitions were sometimes manifest directly in prolonged and repeated peaks of activity while in other instances the changes were indirectly reflected in increased time between peaks and fragmentation of normally coherent peaks of activity. The amplitude of EMG activity was also altered by DAF but the direction of amplitude change varied with muscles and subjects. Similarities and differences were found between EMG patterns of normal speakers under DAF and EMG patterns of stutterers.
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