Rotational Jitter around the Observer's Line of Sight Can Facilitate Visually Induced Perception of Forward Self-Motion (Forward Vection)

Previous studies have shown that the addition of uttering motion into a visual inducer facilitates vection. A psychophysical experiment with 12 observers found that the expanding visual inducer, which contained rotational jitter around the observer's line of sight, can induce stronger forward vection than a pure radial expansion without any additional jittering component. The results suggested that angular rotational jitter can facilitate vection without the enhancement of motion parallax, which has been considered one of the critical factors in explaining jitter effects.