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INFLUENCE OF THE STATIC IMAGES THAT EVOKE ILLUSORY MOTION PERCEPTION ON THE EYE MOVEMENTS AND THE BODY SWAY
  1. Y Inoue
  1. Faculty of Information Science and Technology, Osaka Institute of Technology, 1-79-1 Kitayama, Hirakata City, Osaka, 573-0196 Japan

Abstract

Previous studies suggested that eye movements might be one of the factors that static images evoke illusory motion perception. The influence that visual information gives to posture control is also known to be big. However, the relationship between the posture control and the illusory motion perceptions has not been clear well. Therefore we examined how static illusory motion images affected the body sway and the eye movements. Seven participants (20±2 years old) took part in the experiment. Wavy image (W condition), two types of parallel images (P1, P2 condition), and expanded image (E condition) were used as four conditions that evoke illusory motion perception. One plain image was used as the control condition (CON condition) that does not evoke illusory motion perception. Participant was instructed to stand on a pressure sensor plate and viewed the images by a 46 inches monitor. Each image was presented for 2 minutes. Participants' postural movements were measured with centre of plantar pressure (COP) by a pressure sensor plate. The eye movements were measured with horizontal electro-oculogram. Comparing four illusory conditions, many participants reported that more illusory motion perception was evoked with W and E1 conditions. The number of horizontal eye movements was larger with W condition (p<0.01) and E1 condition (p<0.05) than with CON condition. Although no significant differences between the five conditions were observed on the total movement distance of the COP, the movements to swing of the COP of W condition tended to be different from that of CON condition. Although the COP of CON condition tended to sway slow and big, the COP of W condition tended to sway very smaller and fast. Our results suggested that the static images that evoke illusory motion perception more would induce faster eye movements and that these quick eye movements might induce small and fast body sway.

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