Communication Sciences and Disorders 4411A/B Lecture Notes - Lecture 12: Glottal Stop, Vocal Folds, Vocal Resonation
19 Nov 2018
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Anatomy/physiology review: voicing/phonation, arytenoids rotate to midline. Laryngeal adductor muscles: vocal folds adduct, closes glottal opening. Phonating position : subglottal air pressure builds, vocal folds blown apart, vocal fold tissue recoils. Voice pitch: voicing, one cycle of phonation vocal folds open and close, repeated cycles of phonation produces sound, pitch determined by, rate (frequency) of vocal fold opening/closing. In hertz, vibrations/second, or cycles/second: size and mass of vocal folds determines pitch, anatomical, contraction of laryngeal muscles. Voice disorder facts: aka dysphonia or phonatory disorder. In children usually related to vocal abuse/misuse and temporary. In adults more variable etiology: some high-risk occupations: Teachers: singers, salespeople, clerks, administrators and managers. Voice cracks: too low, too high, diplophonia. Ability to produce two distinct pitches at same time. Quality: hoarse/rough, breathy, harsh, nasal, de-nasal, vocal tremor. Loudness: mono-loudness, too loud, too soft, aphonia. No voice, when mouth moves but no sound comes out: spasmodic dysphonia.
