November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Incomplete transfer between tilt and slant after-effects
Author Affiliations
  • Wendy J. Adams
    University of Glasgow, Scotland
Journal of Vision November 2002, Vol.2, 98. doi:10.1167/2.7.98
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      Wendy J. Adams, Pascal Mamassian; Incomplete transfer between tilt and slant after-effects. Journal of Vision 2002;2(7):98. doi: 10.1167/2.7.98.

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Abstract

Introduction

We are interested in determining the level at which perceptual after-effects occur. Depth after-effects appear to be driven by adaptation at a surface representation level, rather than retinally-defined characteristics. For example, Domini, Adams & Banks (2001) showed that prolonged viewing of a stereoscopically defined curved surface produces after-effects related to the perceived curvature rather than the pattern of retinal disparities per se. Similarly, Köhler & Emery (1947) presented oppositely oriented lines alternately to two eyes but failed to find the depth after-effects predicted by low-level, monocular adaptation mechanisms.

We investigated whether:

  • Monocular adaptation to tilted Gabor patches leads to binocular slant after-effects (SAE), or

  • Binocular adaptation to a slanted surface produces monocular tilt after-effects (TAE).

Methods

After monocular or binocular adaptation, the amount of TAE and SAE were measured by the method of constant stimuli. The adaptation stimuli were Gabor patches rotated by ±3? from vertical presented to the left and right eyes. In the binocular condition they were presented to both eyes simultaneously, creating a percept of a slanted surface with zero tilt. The same stimuli were used for monocular adaptation, but were presented to the eyes alternately, creating percepts of zero-slant, tilted surfaces. Top-ups of the adaptation stimuli were presented between trials.

Results & Conclusions

Binocular adaptation produced large SAEs and smaller TAEs. Monocular adaptation produced large TAEs and smaller but clear SAEs, in contrast to Köhler & Emery's findings. This pattern of results suggests that a common, low-level adaptation to monocular orientation is involved in slant and tilt after-effects. However, the incomplete transfer between slant and tilt makes it clear that higher level adaptation is also involved, perhaps at the level of surface representation.

Adams, W. J., Mamassian, P.(2002). Incomplete transfer between tilt and slant after-effects [Abstract]. Journal of Vision, 2( 7): 98, 98a, http://journalofvision.org/2/7/98/, doi:10.1167/2.7.98. [CrossRef]
Footnotes
 WJA funded by HFSP grant RG0109/1999-B
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