2.2. Experimental conditions
Using an HVLab Vibrotactile Perception Meter (i.e. VPM), thresholds
for the perception of 20 Hz and 160 Hz vibration were measured at the fingertip and thenar eminence of the left hand
and at four locations on the sole of the left foot: the whorl of the
big toe, the whorl of the heel, the medial ball, and the lateral ball.
The location of the medial ball of the left foot was defined as 4 cm
from the right side of the foot and 4 cm to the rear of crotch of the
big toe. The location of the lateral ball of the left foot was defined as
4 cm from the left side of the foot and 4 cm to the rear of the crotch
of the little toe