C_S_D 4220 Lecture Notes - Lecture 1: Vocal Process, Vocal Fry Register, Dysphonia

• School: Mizzou
• Department: Communication Science And Disorders
• Course: C_S_D 4220
• Professor: Slansky

Document Summary

Source of airflow and pressures to generate sound. Pressure gradient between alveolar pressure (i. e. , alveoli in lungs) and atmospheric pressure. Abdominal wall (ab: aerodynamics: lung volume. Space or displacement of a defined area; (3-dimensional) Total lung capacity= vital capacity + residual volume (approx. Tidal volume- volume of air exchanged during specified task. Resting tidal volume- at rest : aerodynamics: air flow. Quantity of air moving through (across) a given area per unit of time. Flow through vocal folds; also oral and nasal airflow. Transglottal resistance: nasal (velopharyngeal resistance, oral (articulatory constriction) Pressure force per unit area acting perpendicular to a surface. Expressed relative to atmospheric pressure p(atm: alveolar pressure: 105 mm hg or 142. 8 cm h2o. 7-10 cm h2o (range 4-8 during normal speech) Intraoral pressure: air buildup behind oral structures for plosives, also, behind construction for fricatives. Nasal pressure: aerodynamics: air pressure (cont. , active forces. Primary- contracting diaphragm during inhalation: diaphragm flattens & lowers.