Physiology of the Larynx Under Daily Stress

Uses ultra-high-speed cinematography to show the motions of the vocal cords in the larynx in producing sounds persons normally make in their daily activities. Shows motions of vocal cords producing the "a" vowel, laughing, coughing, clearing the throat, and singing. Discusses the nature of the vocal cords and shows the movement of the vocal cords and larynx in producing tones controlled by the diaphragm and tones controlled by the vocal cords only.