Human auditory-laryngeal reflex.

概要

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The mechanism of laryngeal control through the auditory system was studied in terms of change in activity of intrinsic laryngeal muscles. Healthy adults during phonation received repeated click-sound stimuli in both ears. The muscle activity of their larynx was recorded with bipolar hooked wire electrodes inserted into the crico-thyroid muscles and/or lateral crico-arytenoid muscles. The induced EMG potentials were rectified and averaged and the activity change in the intrinsic laryngeal muscles caused by the auditory stimulus was determined. The following results was obtained. 1) In most subjects who received sound stimulation, increasing of muscle activity with a steady short-latency was recognized, which was thougt to be a so called' reflex' unrelated to the cerebrum. 2) Both crico-thyroid muscles reacted first after auditory stimulation, followed by the right lateral crico-arytenoid muscle, and finally the left lateral crico-arytenoid muscle. 3) The laryngeal reflex was influenced stronger and more constantly by auditory stimulation than by other stimulation.
日本音声言語医学会の論文