Fig. (3) Typical data examples of SI and HI values. (a) masticated for 20 masticatory strokes (b) masticated until just before natural swallowing. Shaded area shows the range of normal mastication reported by Sugimoto et al. [13]. Note that closed dots (G+) locates closer to the shaded range than open dots (G-) at 20 masticatory strokes.