Conditions for view invariance in the neural response to visual symmetry

Makin, Alexis ORCID: 0000-0002-4490-7400, Rampone, Giulia ORCID: 0000-0002-2710-688X and Bertamini, Marco ORCID: 0000-0001-8617-6864 (2015) Conditions for view invariance in the neural response to visual symmetry Psychophysiology, 52 (4). pp. 532-543. ISSN 0048-5772, 1469-8986

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Abstract

Symmetry detection is slow when patterns are distorted by perspective, perhaps due to a time-consuming normalization process, or because discrimination relies on remaining weaker regularities in the retinal image. Participants viewed symmetrical or random dot patterns, either in a frontoparallel or slanted plane (±50°). One group performed a color discrimination task, while another performed a regularity discrimination task. We measured a symmetry-related eventrelated potential (ERP), beginning around 300 ms. During color discrimination, the ERP was reduced for slanted patterns, indexing only the remaining retinal structure. During regularity discrimination, the same ERP was view invariant, and identical for frontoparallel or slanted presentation. We conclude that normalization occurs rapidly during active symmetry discrimination, while symmetry-sensitive networks respond only to regularity in the retinal image when people are attending to other features.

Item Type:	Article
Uncontrolled Keywords:	Symmetry, Event-related potentials, Sustained posterior negativity, View invariance, Perspective distortion
Depositing User:	Symplectic Admin
Date Deposited:	22 Apr 2015 14:17
Last Modified:	01 Mar 2026 00:50
DOI:	10.1111/psyp.12365
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/2010303
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