Shifts in perceived position of flashed stimuli by illusory object motion

Katsumi Watanabe, Romi Nijhawan, Shinsuke Shimojo

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Moving stimuli cause the position of flashed stimuli to appear shifted in the direction of motion (position capture). To examine whether position capture depends on low-level motion interactions or perception of integrated object motion, we employed a slit-view display. Two line-drawn diamonds translated horizontally in opposite directions, one above and one below the fixation cross, either behind an occluding surface with a narrow slit or without occluding surface. When the diamonds were in vertical alignment, two vertical bars were flashed, one in the center of each diamond. In the slit-view condition, the diamonds were visible through a 4-, 2-, or 1-pixel vertical slit; the width of the flashed bars always matched the width of the slit. Even though the horizontal component of physical motion was greatly reduced or absent in the slit-view conditions, observers perceived diamonds moving behind the occluding surface. Furthermore, the position of the flashed bar was captured by the moving diamonds such that each bar appeared shifted in the direction of perceived motion. We conclude that the position capture reported here has a component based on high-level motion processing that is responsible for dynamically integrating object motion and shape.

Original languageEnglish
Pages (from-to)2645-2650
Number of pages6
JournalVision Research
Volume42
Issue number24
DOIs
Publication statusPublished - 2002 Nov 1

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Keywords

  • Anorthoscopic perception
  • Localization
  • Motion
  • Occlusion
  • Shape

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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