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Myoelastic-aerodynamic theory of phonation
Adduction, vibration, abduction
Adduction
Adduction muscles contract: vibration begins
Vibration
Pressure below vocal folds increases and blows them apart. Puff of air (air flow) released into the articulatory system. Vocal fold elasticity and Bernoulli effect return vocal folds to midline. Vertical phase difference
Abduction
Abduction muscles contracts: vibration ends