Effects of background field-of-view and depth-plane on the oculogyral illusion

Fred H. Previc, Kennith W. Stevens, Nadeem Ghani, David A. Ludwig

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

This study examined the effects of background field-of-view and depth-plane on the oculogyral illusion. Seven subjects viewed a stationary fixation stimulus during the postrotatory interval following a 45-sec. constant-velocity chair rotation. The duration of the illusory movement of the fixation stimulus during the postrotatory interval was measured, along with the duration of the illusion of whole-body rotation (known as the somatogyral illusion) and the duration of the subject's slow-phase vestibular nystagmus. Subjects viewed the fixation stimulus by itself in a No-background condition or when surrounded by six background fields formed by the combination of two fields-of-view (35° and 115°) and three depth-planes (near, coplanar, and far). The different background fields inhibited the oculogyral illusion relative to the No-background condition but did not differ statistically from each other. The somatogyral durations better matched the oculogyral ones than did nystagmus decay, especially when a background field was present. These results suggest that the oculogyral illusion is more related to the experience of whole-body rotation than to oculomotor mechanisms and that the inhibitory effect of a background scene is only modestly affected by its field-of-view and depth-plane.

Original languageEnglish (US)
Pages (from-to)867-878
Number of pages12
JournalPerceptual and motor skills
Volume93
Issue number3 PART 1
DOIs
StatePublished - Dec 2001

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Sensory Systems

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