Effects of depth, eccentricity and size of additional static stimulus on visually induced self-motion perception.

Static visual stimulus presented behind a moving pattern inhibits vection. On the other hand, the same static stimulus facilitates vection if it is located in front of the moving pattern. In this study, the effects of depth, eccentricity and size of the additional static stimulus on inhibition and facilitation of horizontal linear vection were investigated. Results indicated that both inhibition and facilitation become conspicuous with increasing the size of the static stimulus. Furthermore, the inhibition caused by the static foreground is dominated by the central stimulus, while the facilitation caused by the static background is more effective in the peripheral stimulus.