Physiology of phonation
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| nonspeech laryngeal function | protection/ prohibition of foreign objects into the lungs
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| coughing | reflux response by tissue of the respiratory passageway to an irritant or foreign object; creates (+) subglottal pressure
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| abdominal (thoracic) fixation | process of capturing air within the thorax to provide muscles with a structure on which to push or pull
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| larynx | a cartilaginous structure housing two bands of tissue called vocal folds
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| vocal folds | bands of tissue that are visible from a point immediently behind the tongue, looking down towards the lungs
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| Bernoulli effect | given a constant volume flow of air or fluid, at a point of constriction, there will be a decrease in air pressure (P) perpendicular to flow & an increase in velocity of flow
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| minimum subglottal pressure | amount of pressure needed to blow open the vocal folds in order to sustain phonation; 3-5 cm of water
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| voicing | the product of repeated opening and closing of the vocal folds
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| vibration of VFs | the product of airflow interacting with tissue in the absence of repetitive muscular contraction
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| vocal attack | used to start phonation; voice onset; adduct vocal folds, moving them into the air stream
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| termination of phonation | abduct vocal folds; voice offset
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| sustained phonation | hold vocal folds in fixed position in the air stream
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| vocal fold nodules | a callous-like, protective layer of epithelium on the vocal folds as a result of vocal abuse
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| vocal fundamental frequency | one primary frequency of vibration (for a speech sound)
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| minimum driving pressure | see minimum subglottal pressure
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| portable manometer | gives the client feedback about their respiratory ability, provides clinician with a measurable function
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| pitch | the perceptual correlate of frequency; what you perceive frequency as
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| optimal pitch (frequency) | the pitch of vocal fold vibration that is optimal for an individual; most efficient frequency of vibration for a given pair of vocal fodls
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| habitual pitch | the frequency of vibration of VFs that is normally used in conversation; ideally the same as the optimal
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Created by:
terriers16
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