Size matters: Perceived depth magnitude varies with stimulus height. Tsirlin, I., Wilcox, L., & Allison, R. In Vision Sciences Society Annual Meeting, Journal of Vision, volume 14, pages 977. 2014. ![Size matters: Perceived depth magnitude varies with stimulus height [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper -1 -2 doi abstract bibtex Stereoscopic acuity is known to vary with the overall size and width of the target. Recently, Tsirlin et al. (2012) suggested that perceived depth magnitude from stereopsis might also depend on the vertical extent of the stimulus. To test this hypothesis we compared perceived depth using small discs versus long bars with equivalent width and disparity. We used three estimation techniques. The first two, a virtual ruler and a touch-sensor (for haptic estimates), required that observers make quantitative judgements of depth differences between objects. The third method was a conventional disparity probe. This last technique, while often used for depth estimation, is a measure of disparity matching rather than quantitative depth perception. We found that depth estimates collected using the virtual ruler and the touch-sensor were significantly larger for the bar stimuli than for the disc stimuli. The disparity probe method yielded the same disparity estimates for both types of stimulus; which was not surprising given that they had the same relative disparity. In a second experiment, we measured perceived depth, using the virtual ruler, as a function of the height of a thin bar. In agreement with the first experiment, we found that perceived depth increased with increasing bar height. The dependence of perceived depth on the height of the stimulus is likely the result of the integration of disparity along the vertical edges, which enhances the reliability of depth estimation. The observed reduction in the magnitude of depth estimates for less reliable disparity signals may reflect a reweighting of depth cues or the expression of a bias towards small-disparities. Our results also underscore the often-overlooked difference between measurements of depth and disparity, as the effect of target height was obscured when the disparity probe was used.Meeting abstract presented at VSS 2014
@incollection{Tsirlin22082014,
abstract = {Stereoscopic acuity is known to vary with the overall size and width of the target. Recently, Tsirlin et al. (2012) suggested that perceived depth magnitude from stereopsis might also depend on the vertical extent of the stimulus. To test this hypothesis we compared perceived depth using small discs versus long bars with equivalent width and disparity. We used three estimation techniques. The first two, a virtual ruler and a touch-sensor (for haptic estimates), required that observers make quantitative judgements of depth differences between objects. The third method was a conventional disparity probe. This last technique, while often used for depth estimation, is a measure of disparity matching rather than quantitative depth perception. We found that depth estimates collected using the virtual ruler and the touch-sensor were significantly larger for the bar stimuli than for the disc stimuli. The disparity probe method yielded the same disparity estimates for both types of stimulus; which was not surprising given that they had the same relative disparity. In a second experiment, we measured perceived depth, using the virtual ruler, as a function of the height of a thin bar. In agreement with the first experiment, we found that perceived depth increased with increasing bar height. The dependence of perceived depth on the height of the stimulus is likely the result of the integration of disparity along the vertical edges, which enhances the reliability of depth estimation. The observed reduction in the magnitude of depth estimates for less reliable disparity signals may reflect a reweighting of depth cues or the expression of a bias towards small-disparities. Our results also underscore the often-overlooked difference between measurements of depth and disparity, as the effect of target height was obscured when the disparity probe was used.Meeting abstract presented at VSS 2014},
annote = {Vision Sciences Society 2014, St. Petersburg},
author = {Tsirlin, Inna and Wilcox, Laurie and Allison, Robert},
booktitle = {Vision Sciences Society Annual Meeting, Journal of Vision},
date-modified = {2015-01-05 00:03:19 +0000},
doi = {10.1167/14.10.977},
journal = {Journal of Vision},
keywords = {Stereopsis},
number = {10},
pages = {977},
title = {Size matters: Perceived depth magnitude varies with stimulus height},
url = {http://www.journalofvision.org/content/14/10/977.abstract},
url-1 = {http://www.journalofvision.org/content/14/10/977.abstract},
url-2 = {http://dx.doi.org/10.1167/14.10.977},
volume = {14},
year = {2014},
url-1 = {http://www.journalofvision.org/content/14/10/977.abstract},
url-2 = {https://doi.org/10.1167/14.10.977}}
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