Abstract
The observations of the laryngeal behavior on deglutition and phonation using a video tape recording system were reported. This was a simultaneous electromyogram and fluoroscopic image recording system of swallowing, and a stroboscopic color video recording of vocal fold vibration. The usefulnesses of the former system were (1) multidimensional observations, (2) observation of relationships between actions of muscles (4ch EMG) and movements of each part of the food channel, (3) easy reproduction, easy set-up and untroubled operation, (4) deciding of aspiration's type. Those of the latter were (1) objectivity and reproducibility, (2) comparisons of pre-and post-therapeutic status, (3) compact equipment and ease of operation.
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