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Physio. of Phonation

Physiology of Phonation

QuestionAnswer
three most common vocal registers modal register, falsetto, glottal fry or pulse register
modal register refers to the pattern of phonation used in daily conversation; the most important register for SLPs; the most efficient register
vertical mode of phonation the vocal folds are an undulating wave of tissue; the air is bubbling through the adducted folds; not like a door swinging on a hinge
vocal fundamental frequency one primary frequency of vibration
harmonics whole number multiples of the fundamental frequency; provide important acoustical information for identification of vowels and voiced phonemes
minimum driving pressure for modal phonation 3 - 5 cm of water
portable manometer - minimum functional ability for client produce 5 cm of water pressure for 5 seconds
maximum phonation - clinical technique client sustains a vowel as long as he can; tests function of vocal folds, vital capacity, and checking action
glottal fry (pulse register) crackly "popcorn" quality of voice; extremely low in pitch and sounds rough (like eggs frying); frequencies: 30 Hz to 80-90 Hz
glottal fry requires low subglottal pressure to sustain it (~2 cm)
glottal fry tension of the vocalis is significantly reduced relative to the modal vibration, so the vibrating margin is flaccid and thick; the lateral portion of the vocal folds is tensed so there is strong medial compression with short, thick vocal folds and low Ps
glottal fry vocal folds take on a secondary, syncopated mode of vibration, such that there is a second beat for every cycle of the f0
Created by: sullivancl
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