Influences of the Laryngeal Afferent Inputs on Induced Vocalization in the Cat

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The purpose of the present study is to elucidate the functional roles of the laryngeal afferent inputs in controlling vocalization. Vocalization was induced by the electrical stimulation of the pontine call site (PCS) in ketamine anesthetised cats. Firstly, we investigated the effects of the laryngeal deafferentation on respiratory duration and voice quality during induced vocalization. Secondly, to investigate more detail of the laryngeal influences, the upper airway was isolated from the lower one. The airflow application to the isolated upper airway during PCS stimulation induced vocalization. We investigated the effects of the airflow or pressure to the upper airway on intralaryngeal muscle activity during PCS stimulation.<BR>The laryngeal deafferentation decreased respiratory duration during PCS stimulation and affected voice quality with reducing the vocal fold adductor and tensor activities. The airflow to the isolated upper airway during PCS stimulation increased adductor and tensor activities and their durations. There was a critical subglottic pressure level at which adductor and tensor activities were suddenly increased with vocalization. Pressure application to the isolated upper airway with closed mouth and nostrils did not significantly affect the adductor and tensor activities.<BR>These results suggest that the afferent input from laryngeal pressure receptors is not the main factor modulating the vocal movement, and that the laryngeal afferent inputs, such as stretch- and vibration-sensitive ones, play an important role in vocal motor control.

Influences of the Laryngeal Afferent Inputs on Induced Vocalization in the Cat

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