Electrophysiological priming effects confirm that the extrastriate symmetry network is not gated by luminance polarity.

Makin, Alexis DJ ORCID: 0000-0002-4490-7400, Piovesan, Andrea, Tyson-Carr, John ORCID: 0000-0003-3364-2184, Rampone, Giulia ORCID: 0000-0002-2710-688X, Derpsch, Yiovanna and Bertamini, Marco ORCID: 0000-0001-8617-6864 (2020) Electrophysiological priming effects confirm that the extrastriate symmetry network is not gated by luminance polarity. European Journal of Neuroscience, 53 (4). pp. 964-973. ISSN 0953-816X, 1460-9568

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Abstract

It is known that the extrastriate cortex is activated by visual symmetry. This activation generates an ERP component called the Sustained Posterior Negativity (SPN). SPN amplitude increases (i.e., becomes more negative) with repeated presentations. We exploited this SPN priming effect to test whether the extrastriate symmetry response is gated by element luminance polarity. On each trial, participants observed three stimuli (patterns of dots) in rapid succession (500 ms. with 200 ms. gaps). The patterns were either symmetrical or random. The dot elements were either black or white on a grey background. The triplet sequences either showed repeated luminance (black > black > black, or white > white > white) or changing luminance (black > white > black, or white > black > white). As predicted, SPN priming was comparable in repeated and changing luminance conditions. Therefore, symmetry with black elements is not processed independently from symmetry with white elements. Source waveform analysis confirmed that this priming happened within the extrastriate symmetry network. We conclude that the network pools information across luminance polarity channels.

Item Type:	Article
Uncontrolled Keywords:	luminance polarity, reflection, regularity, repetition enhancement, sustained posterior negativity
Depositing User:	Symplectic Admin
Date Deposited:	28 Sep 2020 10:01
Last Modified:	16 Jun 2026 07:34
DOI:	10.1111/ejn.14966
Open Access URL:	https://doi.org/10.1111/ejn.14966
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3102841
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