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The influence of object size and surface shape on shape constancy from stereo.

The influence of object size and surface shape on shape constancy from stereo.
The influence of object size and surface shape on shape constancy from stereo.
The failure of shape constancy from stereoscopic information is widely reported in the literature. In this study we investigate how shape constancy is influenced by the size of the object and by the shape of the object's surface. Participants performed a shape-judgment task on objects of five sizes with three different surface shapes. The shapes used were: a frontoparallel rectangle, a triangular ridge surface, and a cylindrical surface, all of which contained the same maximum depth information, but different variations in depth across the surface. The results showed that, generally, small objects appear stretched and large objects appear squashed along the depth dimension. We also found a larger variance in shape judgments for rectangular stimuli than for cylindrical and ridge-shaped stimuli, suggesting that, when performing shape judgments with cylindrical and ridge-shaped stimuli, observers rely on a higher-order shape representation.
237-247
Champion, Rebecca A.
cc00ecfc-1961-41b2-90e4-c6876caa679e
Simmons, David R.
067ed907-ae56-45b1-b1fc-7ed52fa3136c
Mamassian, Pascal
c8cd94cf-3645-4f60-826c-0d1ab349bb00
Champion, Rebecca A.
cc00ecfc-1961-41b2-90e4-c6876caa679e
Simmons, David R.
067ed907-ae56-45b1-b1fc-7ed52fa3136c
Mamassian, Pascal
c8cd94cf-3645-4f60-826c-0d1ab349bb00

Champion, Rebecca A., Simmons, David R. and Mamassian, Pascal (2004) The influence of object size and surface shape on shape constancy from stereo. Perception, 33 (2), 237-247. (doi:10.1068/p5173).

Record type: Article

Abstract

The failure of shape constancy from stereoscopic information is widely reported in the literature. In this study we investigate how shape constancy is influenced by the size of the object and by the shape of the object's surface. Participants performed a shape-judgment task on objects of five sizes with three different surface shapes. The shapes used were: a frontoparallel rectangle, a triangular ridge surface, and a cylindrical surface, all of which contained the same maximum depth information, but different variations in depth across the surface. The results showed that, generally, small objects appear stretched and large objects appear squashed along the depth dimension. We also found a larger variance in shape judgments for rectangular stimuli than for cylindrical and ridge-shaped stimuli, suggesting that, when performing shape judgments with cylindrical and ridge-shaped stimuli, observers rely on a higher-order shape representation.

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Published date: 2004

Identifiers

Local EPrints ID: 40356
URI: http://eprints.soton.ac.uk/id/eprint/40356
PURE UUID: 0f6c7222-2509-48ae-8e37-ca1d3548ac9d

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Date deposited: 03 Jul 2006
Last modified: 15 Jul 2019 19:00

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