Table 2. Studies using gustatory stimulation under DW-MRI scans.

Study id	Stimulating agent	DWI acquisition
5	One 500-mg tablet of ascorbic acid	Repeated 8 times with intervals of 30 s
8	One 500-mg tablet of ascorbic acid	Continuous series without time interval between them (range, 24–28 min)
11	Two 500-mg tablet of ascorbic acid	Repeated 10 times
12	5 mL of a commercially available lemon juice	Repeated 9 times without a time interval
14	Six 100 mg tablets of ascorbic acid	Repeated 7 times with intervals of 18 s
15	5 mL of a commercially available lemon juice	30 seconds after stimulation, the DW sequence was repeated
16	Six 100 mg tablets of ascorbic acid	Repeated 7 times with intervals of 18 s
37	5 mL of a commercially available lemon juice	30 seconds after stimulation, the DW sequence was repeated
39	5 mL of a commercially available lemon juice	30 seconds after stimulation, the DW sequence was repeated