The effect of haptic information on visual illusion when visual and haptic stimuli were presented in the same spatial orientation

Keiko Omori, School of literature and Social Sciences, Nihon University

Abstract
Our previous study demonstrated that information given by touch altered the appearance of visual illusion despite dominance of visual experience (Omori et al., 2003). In the previous study, however, the spatial orientation of visual and haptic stimuli was not controlled. The present study, therefore, was designed to investigate the effect of haptic information on visual illusions for the Hering and Wundt figures under the conditions where visual and haptic stimuli were the same in spatial orientation. Wooden pieces with various curvatures were used as haptic stimuli. Participants were asked to judge the apparent curvature of each test illusion figure, with or without haptic stimuli. It was found that the visual illusions were biased to the direction of the information given by touch. The results also showed that haptic information influenced visual illusions most markedly under the condition in which both visual and haptic stimuli were presented in the same spatial orientation.

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