Figure 1A,B. Experimental setting. (A) A series of images in MRI movie; a–e correspond to the timings shown in the voice record (left); (B) Landmarks (St, Tt, Tv, C2ip, and Tp) and parameters for linear (IL, TA, and TP) and angular (Vp) measurements. St indicates Stomion; Tt, tip of the tongue; Tv, tip of the velum; C2ip, most inferoposterior point of the second cervical vertebral body; Tp, intersection of the posterior contour of the tongue and the St-C2ip line. IL, inter-lip distance on the line perpendicular to the St-C2ip line (mm); TA, distance between Tt and C2ip (mm); TP, distance between Tp and C2ip (mm); Vp, angle between the Tsp-C2ip line and the St-C2ip line (degrees)