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Unformatted text preview: CSD 250 CSD 250 Speech Science Speech production: Anatomy & physiology Next in the Speech Chain Next in the Speech Chain Speech: Uniquely Human Speech: Uniquely Human Human beings possess a unique tongue and mouth that have evolved to facilitate the production of speech; we also possess unique brain mechanisms that allow us automatically to produce complex rule­ governed maneuvers of the tongue, lips, lungs, and other organs. Speech Production: Three Speech Production: Three Components Subglottal System: Subglottal System: Respiration Function Breathing – Primarily vegetative – Adapted for speech production – Inspiration (inhalation) – Expiration (exhalation) A Simplified Model A Simplified Model Lungs Trachea Diaphragm Pleural Space • Elastic & can store elastic energy • Space between lungs and chest wall: An enclosed volume • Ppl: Pressure of the space • Vpl: Volume of the space For Inspiration to Happen For Psubglottal < Patmospheric In the Pleural Space (an enclosed volume): Vpl is increased by • PplVpl = Constant • Ppl ↓ when Vpl ↑ • Lowering the diaphragm and using inspiratory muscles to expand rib cage (pull the push rod down) Expiration During Quiet Expiration During Quiet Breathing The elastic recoil force will push air out of the lungs No extra force is necessary One could force the air out faster by using expiratory muscles (push the rod upw...
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