Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/26733
Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Luminance-polarity distribution across the symmetry axis affects the electrophysiological response to symmetry
Author(s): Wright, Damien
Mitchell, Claire
Dering, Benjamin
Gheorghiu, Elena
Keywords: Luminance-polarity
colour
symmetry
EEG
ERP
Sustained Posterior Negativity
microstates
Issue Date: Jun-2018
Date Deposited: 16-Feb-2018
Citation: Wright D, Mitchell C, Dering B & Gheorghiu E (2018) Luminance-polarity distribution across the symmetry axis affects the electrophysiological response to symmetry. NeuroImage, 173, pp. 484-497. https://doi.org/10.1016/j.neuroimage.2018.02.008
Abstract: Electrophysiological studies of symmetry have found a difference wave termed the Sustained Posterior Negativity (SPN) related to the presence of symmetry. Yet the extent to which the SPN is modulated by luminance-polarity and colour content is unknown. Here we examine how luminance-polarity distribution across the symmetry axis, grouping by luminance polarity, and the number of colours in the stimuli, modulate the SPN. Stimuli were dot patterns arranged either symmetrically or quasi-randomly. There were several arrangements: ’segregated’-symmetric dots were of one polarity and random dots of the other; ‘unsegregated’-symmetric dots were of both polarities in equal proportions; ‘anti-symmetric’-dots were of opposite polarity across the symmetry axis; ‘polarity-grouped anti-symmetric’-as anti-symmetric but with half the pattern of one polarity and the other opposite; multi-colour symmetric patterns made of either two, three and four colours. We found that the SPN is: reduced by the amount of position-symmetry, sensitive to luminance-polarity mismatch across the symmetry axis and not modulated by the number of colours in the stimuli. Our results show that the sustained nature of the SPN coincides with the late onset of a topographic microstate sensitive to symmetry. These findings emphasise the importance of not only position symmetry, but also luminance polarity matching across the symmetry axis.
DOI Link: 10.1016/j.neuroimage.2018.02.008
Rights: This is an open access article under a Creative Commons Attribution 4.0 International (CC BY 4.0) license: https://creativecommons.org/licenses/by/4.0/
Licence URL(s): http://creativecommons.org/licenses/by/4.0/

Files in This Item:
File Description SizeFormat 
1-s2.0-S105381191830096X-main.pdfFulltext - Published Version3.71 MBAdobe PDFView/Open



This item is protected by original copyright



A file in this item is licensed under a Creative Commons License Creative Commons

Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

The metadata of the records in the Repository are available under the CC0 public domain dedication: No Rights Reserved https://creativecommons.org/publicdomain/zero/1.0/

If you believe that any material held in STORRE infringes copyright, please contact library@stir.ac.uk providing details and we will remove the Work from public display in STORRE and investigate your claim.