CDIS 4213 Chapter Notes - Chapter 7: Dysphonia, Fundamental Frequency, Vocal Folds

• School: University of Arkansas
• Department: Communication Disorders
• Course: CDIS 4213
• Professor: Mary Toner

Document Summary

It serves as either the force that sets the vocal folds into vibration for a quasiperiodic sound (phonated sound) or it provides the air source which becomes turbulent as it passes through a vocal tract constriction (nonphonated. In respiration for speech, inspiration takes place through the action of the inspiratory muscles. These same muscles then control expiration to maintain an appropriate and continuing airflow through the vocal folds. As the volume of air in the lungs decreases, the inspiratory muscles eventually become relaxed and recoil and gravity effect continued exhalation. If speech continues further, the expiratory muscles act to push more air out of the thorax. When the vocal folds do not valve the air by their vibration, the air flow from the lungs becomes turbulent as it passes through vocal tract constrictions. The constriction may be at the level of the vocal folds (like in a whisper) or it may be in the oral cavity (producing /s/, /f/ etc).