Attention, Perception, & Psychophysics

, Volume 81, Issue 1, pp 281–295 | Cite as

Vection strength increases with simulated eye-separation

  • Stephen PalmisanoEmail author
  • Rodney G. Davies
  • Kevin R. Brooks


Research has previously shown that adding consistent stereoscopic information to self-motion displays can improve the vection in depth induced in physically stationary observers. In some past studies, the simulated eye-separation was always close to the observer’s actual eye-separation, as the aim was to examine vection under ecological viewing conditions that provided consistent binocular and monocular self-motion information. The present study investigated whether large discrepancies between the observer’s simulated and physical eye-separations would alter the vection-inducing potential of stereoscopic optic flow (either helping, hindering, or preventing the induction of vection). Our self-motion displays simulated eye-separations of 0 cm (the non-stereoscopic control), 3.25 cm (reduced from normal), 6.5 cm (approximately normal), and 13 cm (exaggerated relative to normal). The rated strength of vection in depth was found to increase systematically with the simulated eye-separation. While vection was the strongest in the 13-cm condition (stronger than even the 6.5-cm condition), the 3.25-cm condition still produced superior vection to the 0-cm control (i.e., it had significantly stronger vection ratings and shorter onset latencies). Perceptions of scene depth and object motion-in-depth speed were also found to increase with the simulated eye-separation. As expected based on the findings of previous studies, correlational analyses suggested that the stereoscopic advantage for vection (found for all of our non-zero eye-separation conditions) was due to the increase in perceived motion-in-depth.


Stereopsis Vection Optic flow Binocular vision Motion-in-depth S3D 



This research was supported by an internal University of Wollongong Faculty of Social Sciences Seed Grant awarded to SP.

Supplementary material

13414_2018_1609_MOESM1_ESM.avi (19.1 mb)
Supplementary Movie 1 (ComboMovieHalfSize.avi). This demonstration (which simultaneously plays four different movies) was designed to be viewed while wearing anaglyph glasses. It shows scaled versions of the four different simulated viewing conditions used in this study: 0-cm (Top Left), 3.25-cm (Top Right), 6.5-cm (Bottom Left) and 13-cm (Bottom Right). The aim of placing these movies next to each other in the demonstration was illustrate their relative differences in disparity range, changing-disparities-over-time, and interocular-velocity-differences. The monocular motion signals in each movie simulate the same speed of forwards self-motion in depth. (AVI 19586 kb)


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Copyright information

© The Psychonomic Society, Inc. 2018

Authors and Affiliations

  • Stephen Palmisano
    • 1
    Email author
  • Rodney G. Davies
    • 1
  • Kevin R. Brooks
    • 2
    • 3
  1. 1.School of Psychology, Faculty of Social SciencesUniversity of WollongongWollongongAustralia
  2. 2.Department of Psychology and Perception and Action Research Centre, Faculty of Human SciencesMacquarie UniversitySydneyAustralia
  3. 3.ARC Centre of Excellence in Cognition and its DisordersMacquarie UniversitySydneyAustralia

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