CSD-2260 Lecture Notes - Lecture 3: Speech Perception, Hypodermic Needle, No Air
20 Oct 2016
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Document Summary
Non-speech laryngeal functions: protective function is the most important role of the larynx, prevents entrance of foreign objects into the lungs. Coughing- forceful evacuation of respiratory passageway in response to irritant or foreign matter. Throat clearing- clears respiratory tract of mucus. Abdominal fixation- impounds air in thorax to stabilize torso. Acoustics: process of vibration is determined by: Elasticity- the property of material that causes it to return to its original shape after displacement. Stiffness- strength of force within a material to return to its original shape after distention. Pneumotachograph airflow in a face mask. Fiberendoscopy- view the vocal folds from above via the nasal cavity, also measures swallowing. Subglottal pressure- measured via hypodermic needle through the cricothyroid or estimated by intraoral pressure when the vocal folds are open. Electroglottograph- electrodes on the neck, measures impendence which corresponds with vocal fold contact. Laryngeal function for speech: phonation- voicing, the product of vibrating vocal folds within the larynx.
