Larynx And Voice: Physiology Of The Larynx Under Daily Stress (1958)

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This educational documentary explores the complex mechanics of the human larynx by utilizing ultra-high-speed cinematography, capturing images at 5,000 frames per second to visualize vocal cord vibrations. Through detailed analysis of various vocal activities—ranging from ordinary speech and laughter to vocal fry and strained coughing—the film illustrates how muscle tension, airflow pressure, and structural elasticity interact during sound production. By comparing graphic data with high-speed footage, the researchers present new physiological concepts regarding the vibratory cycle, specifically highlighting how opening and closing phases shift in response to vocal intensity, pitch, and register changes. Ultimately, the study emphasizes that the larynx is a dynamic and delicate instrument subject to significant stress during daily life, and underscores how advanced imaging provides critical insights into both normal phonation and complex acoustic phenomena.

Keywords: Larynx, vocal cords, high-speed cinematography, phonation, speech physiology, vocal fry, vocal register, glottal vibration, biomedical research, acoustics