Ebbinghaus illusion depends more on the retinal than perceived size of surrounding stimuli

Saki Takao, Colin W.G. Clifford, Katsumi Watanabe

Research output: Contribution to journalArticle

Abstract

A stimulus surrounded by smaller/larger stimuli appears larger/smaller (Ebbinghaus illusion). We examined whether the Ebbinghaus illusion would depend on the retinal or perceived size of the surrounding stimuli. The flash-lag effect, where a flashed stimulus perceptually lags moving stimuli, was used to dissociate the retinal from perceived size of the surrounding stimuli. Two sets of four surrounding disks changed their size smoothly: one with larger disks shrinking, the other with smaller disks expanding. Two identical central disks were presented briefly at various timings relative to the moment when the surrounding disks were physically identical in their size (coincidence time). A significant flash-lag effect was observed for size change (Experiment 1). Participants reported the two central disks being in equal size when they appeared only slightly before the coincidence time. However, this asynchrony was not significantly different from zero and was significantly smaller than the perceptual delay expected from the flash-lag effect (Experiment 2). These results suggest that the Ebbinghaus illusion depends more on the retinal than perceived size of the surrounding stimuli.

Original languageEnglish
Pages (from-to)80-84
Number of pages5
JournalVision Research
Volume154
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • Ebbinghaus illusion
  • Flash-lag effect
  • Size perception

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

Cite this

Ebbinghaus illusion depends more on the retinal than perceived size of surrounding stimuli. / Takao, Saki; Clifford, Colin W.G.; Watanabe, Katsumi.

In: Vision Research, Vol. 154, 01.01.2019, p. 80-84.

Research output: Contribution to journalArticle

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