Orientation invariance in visual shape perception.

Full Abstract

To assess directly the orientation-invariance of specific shape representation stages in humans, we examined whether rotation (on the image plane or in depth) modulates the conjunction and linear non-separability effects in a shape visual search task (M. Arguin & D. Saumier, 2000; D. Saumier & M. Arguin, 2003). A series of visual search experiments involving simple 2D or 3D shapes show that these target type effects are entirely resistant to both planar and depth rotations. It was found however, that resistance to depth rotation only occurred when the 3D shapes had a richly textured surface but not when they had a uniform surface, with shading as the only reliable depth cue. The results also indicate that both planar and depth rotations affected performance indexes not concerned with the target type effects (i.e. overall RTs and magnitude of display size and target presence effects). Overall, the present findings suggest that the shape representations subtending the conjunction and linear non-separability effects are invariant across both planar and depth rotations whereas other shape representation stages involved in the task are orientation-specific.

Author information

Author/s: Blais, Caroline (C); Arguin, Martin (M); Marleau, Ian (I);

Affiliation: Département de Psychologie, Université de Montréal, Canada. caroline.blais(-atsign-)umontreal.ca

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Journal of vision (J Vis), published in United States. (Language: eng)

Reference: 2009-; vol 9 (issue 2) : pp 14.1-23

Dates: Created 2009/03/10; Completed 2009/06/25;

PMID: 19271924, status: MEDLINE (last retrieval date: 6/25/2009, IMS Date: 25 Jun 2009 00:00:00)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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