Spatial Vision , Vol. 20, No. 3, pp. 265 – 276 (2007) VSP 2007. Also available online - www.brill.nl/sv Distortion of apparent shape of an object immediately before saccade HIROYUKI SOGO 1 , ∗ and NAOYUKI OSAKA 2 1 Institute for Human Science and Biomedical Engineering, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan 2 Department of Psychology, Graduate School of Letters, Kyoto University, Kyoto, Japan Received 18 August 2006; accepted 18 October 2006 Abstract —‘Perisaccadic mislocalization’ is an illusion in which a stimulus presented briefly near the time of saccade onset is mislocalized. The amount of mislocalization depends on the stimulus location and the stimulus onset time relative to saccade onset. It is unclear whether perisaccadic mislocalization distorts the shape perception of a single object. To investigate this problem, we asked participants to report whether the apparent shape of a triangle presented for 10 ms before saccade was slanted in the same direction or the opposite direction as the saccade. The results showed that the apparent shape of the triangle was distorted in the direction opposite to the saccade. We compared this apparent distortion with the
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 2007
Keywords: SHAPE PERCEPTION; SACCADE; PERISACCADIC MISLOCALIZATION
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