LING 2P90 Lecture : October 15- Breathing and Speech Production- Physiology cont'd .docx
24 Nov 2012
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Relaxation pressure (pr: pressure generated from passive recoil of lungs and rib cage. Alveolar pressure (palv: air pressure within the lungs. Tracheal pressure (ptrach: air pressure below vocal folds, can not really measure it directly unless you puncture your tracheal directly and insert a tube. Resting expiratory level is always in between 35-40% vital capacity. Insert a curve into the graph; in upper right hand corner you have high volume and high positive pressure; in the lower left hand corner you have a low volume; high negative pressure. The point when you cross the rel line is the point in which you are beginning to inhale. During non-speech breathing you aren"t doing anything to prevent this inhalation cycle. During speech breathing you are going to need to control this relaxation pressure, otherwise you can run out of air; once you loose the air it is like going back to non-speech breathing.
