**: p<0.01, n.s.: not significant.

Figure 5: Contribution of visual input to temporal changes in SVV measured in subjects lying down. All subjects were lying on their left sides during SVV measurements. Error bars represent standard error of means. Although the first and second SVV measurements recorded in the lying position (i.e., 15-minute interval between sitting and lying) in the light were not statistically different, the first and second measurements recorded in the lying position in the dark were statistically different.