June 2004
Volume 4, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2004
Are vertical disparites pooled over depth?
Author Affiliations
  • Philip A. Duke
    York University, Canada
Journal of Vision August 2004, Vol.4, 596. doi:10.1167/4.8.596
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      Philip A. Duke, Ian P. Howard; Are vertical disparites pooled over depth?. Journal of Vision 2004;4(8):596. doi: 10.1167/4.8.596.

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Abstract

To produce representations of stereoscopic 3-D surfaces, the visual system uses vertical disparities to disambiguate depth information provided by horizontal disparities. Duke & Howard (2003) showed that gradients of vertical disparity are pooled over a very narrow range of horizontal disparities (±5 arcmin) for judgements of surface curvature about a vertical axis. In the present study we examined whether vertical size and vertical shear disparities are also processed in a horizontal disparity-specific way. Both size and shear vertical disparities are independent of depth, so pooling would provide more accurate estimates of surface slant and inclination respectively. In Experiment 1 we tested the hypothesis that vertical size disparities are pooled over depth. Test stimuli were 2 superimposed frontal arrays of elements separated in depth by a range of horizontal disparity offsets. Each array was given a different vertical size disparity (+ and − 8% magnification). The arrays should appear oppositely slanted if their vertical size disparities are not pooled. Observers performed a sequential slant matching task for each array. We found horizontal disparity specific processing of vertical size disparity similar to that for curvature judgements. In Experiment 2 we examined whether vertical shear disparities are pooled over depth for judgements of inclination about a horizontal axis. Test stimuli were similar to those in Experiment 1 but each array had a different magnitude of vertical shear disparity (+ and − 5°). We found that vertical shear disparity is pooled over a large range of horizontal disparities, which seems to be determined by the limits of stereopsis.

Natural Sciences and Engineering Research Council of Canada

Duke, P. A., Howard, I. P.(2004). Are vertical disparites pooled over depth? [Abstract]. Journal of Vision, 4( 8): 596, 596a, http://journalofvision.org/4/8/596/, doi:10.1167/4.8.596. [CrossRef]
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