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During phonation, the vocal folds open and close as a result of several laryngeal and extralaryngeal activities. The phases of closure and opening of the vocal folds follow one another at a rate defined by the fundamental frequency (F0). The glottal closed quotient (GCQ) is the fraction of time the glottis is considered closed and has been thought to be a good indicator of voice quality. (Kania et al. 2004: 349) This also applicable to the open quotient.↩︎