Physiology of Phonation
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| three most common vocal registers | modal register, falsetto, glottal fry or pulse register
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| modal register | refers to the pattern of phonation used in daily conversation; the most important register for SLPs; the most efficient register
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| 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
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| vocal fundamental frequency | one primary frequency of vibration
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| harmonics | whole number multiples of the fundamental frequency; provide important acoustical information for identification of vowels and voiced phonemes
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| minimum driving pressure for modal phonation | 3 - 5 cm of water
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| portable manometer - minimum functional ability for client | produce 5 cm of water pressure for 5 seconds
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| maximum phonation - clinical technique | client sustains a vowel as long as he can; tests function of vocal folds, vital capacity, and checking action
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| 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
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| glottal fry | requires low subglottal pressure to sustain it (~2 cm)
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| 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
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| 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
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