Rivalry between occlusion and disparity depth signals.

Karl Frederick Arrington
Richard Held

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

Abstract

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

Note

Published abstract contains figures.

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