Conditions for view invariance in the neural response to visual symmetry

Makin, Alexis James and Rampone, Giulia and Bertamini, Marco (2014) Conditions for view invariance in the neural response to visual symmetry. Psychophysiology, 52 (4). pp. 532-543. ISSN 1469-8986

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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 event-
related 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
Additional Information and Comments: The definitive version is available at
Keywords: Symmetry, Event-related potentials, Sustained posterior negativity, View invariance, Perspective distortion
Faculty / Department: Faculty of Science > Psychology
Depositing User: Giulia Rampone
Date Deposited: 10 Jul 2017 14:01
Last Modified: 10 Jul 2017 14:01

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