November 2002
Volume 2, Issue 7
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Interactions among stereo channels of different scales
Author Affiliations
  • Simone Li
    Syracuse University, USA
  • Bart Farell
    Syracuse University, USA
Journal of Vision November 2002, Vol.2, 320. doi:
  • Views
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Simone Li, Bart Farell; Interactions among stereo channels of different scales. Journal of Vision 2002;2(7):320.

      Download citation file:

      © ARVO (1962-2015); The Authors (2016-present)

  • Supplements


We attempted to find how stereo channels of different spatial scales interact when the observer detected the presence of disparity.


We employed a 2afc method to measure disparity thresholds for compound gratings consisting of sinewaves of spatial frequency combinations F+3F, F+5F, and F+3F+5F. The fundamental frequency F was between 0.25c/d and 1c/d for different subjects. Each component was presented at a variety of contrasts to vary its detection threshold. We manipulated the disparities of the components by either yoking them in space (same spatial offset) or in phase (same phase offset) and compared thresholds for the compound gratings with thresholds for the components when tested alone.


When component disparities were yoked in space, thresholds were generally consistent with independent detection of the components' disparities. Thresholds were determined by the most sensitive channel, with the thresholds for compound gratings equaling the lowest of the component thresholds, in agreement with Heckmann and Schor (1989). However, when disparities were yoked in phase, the results were inconsistent with independent channels. Rather than equaling the lowest component threshold, compound thresholds were similar to or even higher than the highest of the component thresholds.


To account for interactions among stereo channels in disparity detection, we hypothesize that disparity thresholds for the compound gratings are determined by a single channel among those activated by the stimulus. This channel is non-optimal, biased toward the high-frequency components of the compound, regardless of which components have non-zero disparities.

Li, S., Farell, B.(2002). Interactions among stereo channels of different scales [Abstract]. Journal of Vision, 2( 7): 320, 320a,, doi:10.1167/2.7.320. [CrossRef]
 Supported by NEI Grant EY12286

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.