Benwell, C. S.Y., Harvey, M. and Thut, G. (2014) On the neural origin of pseudoneglect: EEG-correlates of shifts in line bisection performance with manipulation of line length. NeuroImage, 86, pp. 370-380. (doi: 10.1016/j.neuroimage.2013.10.014) (PMID:24128738) (PMCID:PMC3980346)
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Abstract
Healthy participants tend to show systematic biases in spatial attention, usually to the left. However, these biases can shift rightward as a result of a number of experimental manipulations. Using electroencephalography (EEG) and a computerized line bisection task, here we investigated for the first time the neural correlates of changes in spatial attention bias induced by line-length (the so-called line-length effect). In accordance with previous studies, an overall systematic left bias (pseudoneglect) was present during long line but not during short line bisection performance. This effect of line-length on behavioral bias was associated with stronger right parieto-occipital responses to long as compared to short lines in an early time window (100–200 ms) post-stimulus onset. This early differential activation to long as compared to short lines was task-independent (present even in a non-spatial control task not requiring line bisection), suggesting that it reflects a reflexive attentional response to long lines. This was corroborated by further analyses source-localizing the line-length effect to the right temporo-parietal junction (TPJ) and revealing a positive correlation between the strength of this effect and the magnitude by which long lines (relative to short lines) drive a behavioral left bias across individuals. Therefore, stimulus-driven left bisection bias was associated with increased right hemispheric engagement of areas of the ventral attention network. This further substantiates that this network plays a key role in the genesis of spatial bias, and suggests that post-stimulus TPJ-activity at early information processing stages (around the latency of the N1 component) contributes to the left bias.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Benwell, Mr Christopher and Thut, Professor Gregor and Harvey, Professor Monika |
Authors: | Benwell, C. S.Y., Harvey, M., and Thut, G. |
College/School: | College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience College of Science and Engineering > School of Psychology |
Journal Name: | NeuroImage |
Publisher: | Elsevier Inc. |
ISSN: | 1053-8119 |
ISSN (Online): | 1095-9572 |
Copyright Holders: | Copyright © 2014 The Authors |
First Published: | First published in NeuroImage 86:370-380 |
Publisher Policy: | Reproduced under a Creative Commons License |
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