Deviations of Eye Movements and Head Rotation during Response Tasks using Targets and HMD

In order to extract the relationship between head-eye movements and visual impressions while using Head-mounted displays (HMD) to view images, two types of response task experiments involving visual stimuli were conducted, using several visual angles. Both head movements and visual impressions increased with the visual angles during the observation of moving visual stimuli. Vestibulo-ocular reflex (VOR) gains as a ratio of eye and head movements decreased as the visual angle increased because the eye movement deviations were relatively small. When the viewer’s reaction required an action, such as rotating the head or aiming at a target, the strength of the viewer’s impression increased, though VOR gains remained at the same level.