September 2005
Volume 5, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   September 2005
Different mechanisms encode the shapes of contours and contour-textures
Author Affiliations
  • Frederick A. A. Kingdom
    McGill Vision Research, Department of Ophthalmology, McGill University, Montreal, PQ, Canada
  • Nicolaas Prins
    Department of Psychology, University of Mississippi, MS, USA
Journal of Vision September 2005, Vol.5, 463. doi:10.1167/5.8.463
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      Frederick A. A. Kingdom, Nicolaas Prins; Different mechanisms encode the shapes of contours and contour-textures. Journal of Vision 2005;5(8):463. doi: 10.1167/5.8.463.

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Abstract

Aim. It is often assumed that curved contours, and textures made from parallel curved contours, are processed by the same mechanism. However, recent evidence from primate neurophysiology and brain-imaging studies suggests that contours and textures might be processed by different mechanisms. We used an adaptation paradigm to test whether the shapes of contours and contour-textures were encoded by the same or by different mechanisms. Method. Subjects adapted to pairs of sinusoidally-shaped contours or contour-textures. The two stimuli from each pair were an octave apart in shape frequency and presented above and below fixation. During the test phase, subjects indicated which of two test contours/contour-textures had the highest shape frequency, and an adaptive procedure found their PSE. Results. Adaptation to contours produced significant shifts in the perceived shape frequency of contours, but relatively little shift in the perceived shape frequency of contour-textures. Adaptation to contour-textures produced significant shifts in the perceived shape frequency of textures, but relatively little shift in the perceived shape frequency of contours. Conclusion. The shapes of contours and contour-textures are encoded by different mechanisms.

Kingdom, F. A. A. Prins, N. (2005). Different mechanisms encode the shapes of contours and contour-textures [Abstract]. Journal of Vision, 5(8):463, 463a, http://journalofvision.org/5/8/463/, doi:10.1167/5.8.463. [CrossRef]
Footnotes
 Supported by NSERC (Canada) grant OGP 0121713 given to F.K.
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