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arytenoids are pressed together for glottal closure, the vocal folds block the airstream, producing stop sounds such as the glottal stop. In between there is a sweet spot of maximum vibration. Also, the existence of an optimal glottal shape for ease of phonation has been shown, at which the lung pressure required to initiate the vocal cord vibration is minimum. This is modal voice, and is the normal state for vowels and sonorants in all

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