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The stereoscopic anisotropy affects manual pointing

Bradshaw, MF and Hibbard, PB and Van Der Willigen, R and Watt, SJ and Simpson, PJ (2002) 'The stereoscopic anisotropy affects manual pointing.' Spatial Vision, 15 (4). 443 - 458. ISSN 0169-1015

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Abstract

Although binocular disparity can in principle provide absolute depth information, perceived stereoscopic depth depends on the relative disparities between points and their spatial arrangement. An example of this is the stereoscopic anisotropy - observers typically perceive less depth for stereoscopic surfaces when depth varies in the horizontal direction than in the vertical direction. We investigated whether this anisotropy also affects manual pointing. Participants were presented with stereograms depicting surfaces that were slanted in depth about either a horizontal axis (inclination) or a vertical axis (slant), and were asked either to point to the edge of a surface, or to estimate its inclination or slant. For both tasks, a clear anisotropy was observed, with participants perceiving greater depth, and also pointing out steeper surfaces, for inclined surfaces than for slanted surfaces. We conclude that both perception and the control of action are subject to a similar stereoscopic anisotropy, and that performance on the two tasks relies on similar depth processing mechanisms.

Item Type: Article
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculty of Science and Health > Psychology, Department of
Depositing User: Users 161 not found.
Date Deposited: 03 Feb 2015 13:12
Last Modified: 17 Aug 2017 17:41
URI: http://repository.essex.ac.uk/id/eprint/12533

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