Rivalry between occlusion and disparity depth signals.

Karl Frederick Arrington
Richard Held

Investigative Ophthalmology & Visual Science,
1995; 36(4). Abstract nr 1737, p. S368


Purpose. To quantify depth rivalry (alternation of perceived depth)that occurs when depth information from occlusion and stereo disparityare inconsistent. Methods. Oscillation rate and duty-cycle weremeasured as a function of disparity, D ( 1D = ~2.2 minutes visualangle). Subjects were asked to judge (2AFC) whether occluded bars,S, were in front of or behind a rectangle, R. Key presses recordeddirections of perceptual alternation over ~35 seconds for eachstimulus function. Results. At D=0 duty was maximal, (i.e., S wasperceived behind R about 90% of the time). At D=1 duty decreased toabout half, but alternation rate typically increased to itsmaximum. As D increased further, both oscillation rate and duty-cycledecreased monotonically. Conclusion. The occlusion and disparitydepth signals are connected via a reciprocal inhibitory tuningmechanism. It is conjectured that the end-stop cell components, thecentral region and the end zones, are reciprocally associated withnear and far tuned disparity sensitive complex cells, respectively.


Published abstract contains figures.

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