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Parallel Visual Coding in 3 Dimensions

Humphreys, Glyn W., Keulers, Nicole, Donnelly, Nick (1994) Parallel Visual Coding in 3 Dimensions. Perception, 23 (4). pp. 453-470. ISSN 0301-0066. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:20262)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.


Evidence from visual-search experiments is discussed that indicates that there is spatially parallel encoding based on three-dimensional (3-D) spatial relations between complex image features. In one paradigm, subjects had to detect an odd part of cube-like figures, formed by grouping of corner junctions. Performance with cube-like figures was unaffected by the number of corner junctions present, though performance was affected when the corners did not configure into a cube. It is suggested from the data that junctions can be grouped to form 3-D shapes in a spatially parallel manner. Further, performance with cube-like figures was more robust to noncollinearity between junctions than was performance when junctions grouped to form two-dimensional planes. In the second paradigm, subjects searched for targets defined by their size. Performance was affected by a size illusion, induced by linear-perspective cues from local background neighbourhoods. Search was made more efficient when the size illusion was consistent with the real size difference between targets and nontargets, and it was made less efficient when the size illusion was inconsistent with the real size difference. This last result occurred even though search was little affected by the display size in a control condition. We suggest that early, parallel visual processes are influenced by 3-D spatial relations between visual elements, that grouping based on 3-D spatial relations is relatively robust to noncollinearity between junctions, and that, at least in some circumstances, 3-D relations dominate those coded in two-dimensions.

Item Type: Article
Subjects: B Philosophy. Psychology. Religion > B Philosophy (General)
Divisions: Divisions > Division of Human and Social Sciences > School of Psychology
Depositing User: P. Ogbuji
Date Deposited: 25 Jun 2009 12:56 UTC
Last Modified: 16 Nov 2021 09:58 UTC
Resource URI: (The current URI for this page, for reference purposes)
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