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