Influence of saccade direction on illusory motion S Matsushita1, S Muramatsu2, A Kitaoka3 |
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1School of Human Sciences, Osaka University, Japan |
| Repeated patterns of asymmetric luminance gradients induce illusory motion perceptions [Kitaoka and Ashida, 2003, Vision, 15, 261-262]. Otero-Millan et al. [2012, The Journal of Neuroscience, 32(17), 6043-6051] have demonstrated that saccades are one of the triggers of such illusory motion. However, it is unknown whether saccade direction affects the magnitude of the illusion. We examined the directional selectivity of the illusion relative to the saccadic direction. The experimental stimuli were illusory patterns that appeared to move vertically or horizontally. In each trial, participants observed the stimulus with their eyes saccading vertically or horizontally, and they reported the magnitude of the illusory motion. We found that the magnitude of the illusion was significantly smaller when the direction of the illusory motion and the direction of the saccade were parallel compared to when they were orthogonal and when eye movement was unrestricted. We concluded that there was directional selectivity between the directions of the illusory motion and the saccades, and this might reflect a suppressive mechanism for the illusory motion. |
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