Abstract
Effect of human-body swing on visibility of scrolled texts with direction dependency is tested two ways, a subjective test and eye movement measurements. The results show that (1) recognition rates of scrolled characters are decreased/increased compared with the rates in body-stationary conditions when characterscrolling direction is congruent/incongruent with body-yawing direction, and (2) in most cases, observed eye movement patterns were similar regardless of the character recognition rate. The important findings are that (1) apparent eye movement pattern is affected by body swing direction because of the vestibulo-ocular reflex (VOR), but (2) the net eye movement after subtracting or compensating the effect of VOR is not affected by body swing direction. These results suggest a higher stage of visual system processing than reflection is affecting the visibility, which is modulated by the relationship between stimulus-motion and body-rotation direction.
