November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Orientation- and frequency-modulated textures at low depths of modulation are processed by off-orientation and off-frequency texture mechanisms
Author Affiliations
  • Nicolaas Prins
    McGill University, Canada
  • Frederick A. A. Kingdom
    McGill University, Canada
Journal of Vision November 2002, Vol.2, 237. doi:10.1167/2.7.237
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      Nicolaas Prins, Frederick A. A. Kingdom; Orientation- and frequency-modulated textures at low depths of modulation are processed by off-orientation and off-frequency texture mechanisms. Journal of Vision 2002;2(7):237. doi: 10.1167/2.7.237.

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Abstract

Intuitively it may seem likely that orientation-modulated (OM) and frequency-modulated (FM) textures are processed utilizing the first-order channels that are most responsive to the first-order (luminance) information contained within the textures. This assumption would imply that the detection or segmentation of orientation-modulated or frequency-modulated textures is accomplished by second-order mechanisms that receive their first-order input from neurons tuned to either the center, or to the peaks in the orientation and spatial frequency distribution of the texture. Here we show that at low depths of modulation this is not the case. Using an adaptation paradigm, we show that the first-order filters involved in the perception of OM and FM textures are those which maximize the differential response between the different texture regions. These filters show preferences for orientations and spatial frequencies that are very different from the center and peak orientation/spatial frequency contained in the stimulus. Our explanation of this result is similar to that made by Regan and Beverley (J. Opt. Soc. Am., 73, 1684 [1983], J. Opt. Soc. Am, A, 2, 147 [1985]) for simple grating stimuli. However, we show that whereas Regan and Beverley's results could be accounted for on the basis of the tuning functions of the putative mechanisms involved, our results can be explained in terms of the characteristics of the textures themselves. Our finding has some important implications. For example, the distribution of activity across texture mechanisms with differing first-order tuning functions may be used to determine the nature of a texture modulation.

Prins, N., Kingdom, F. A. A.(2002). Orientation- and frequency-modulated textures at low depths of modulation are processed by off-orientation and off-frequency texture mechanisms [Abstract]. Journal of Vision, 2( 7): 237, 237a, http://journalofvision.org/2/7/237/, doi:10.1167/2.7.237. [CrossRef]
Footnotes
 This research was supported by Grant No. RGPIN 121713-1997 from NSERC.
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