“…26,27,29,30 Prior isolated investigations of FVFA, LH, TVFM, and vocal registers have used fibreoptic nasendoscopy and videostroboscopy and a range of objective measures such as electroglottography, airflow, and glottal resistance. 28,[31][32][33] However, no research has yet considered the effect of specific manipulations of these three parameters on voice production. To establish the effectiveness of using direct therapy methods to achieve specific manipulation of these three parameters, it is necessary to investigate whether expert clinicians can consistently judge the laryngeal manipulations of speakers and then agree that the speakers are performing the targeted manipulations of FVFA, TVFM, and LH.…”