Dissociable effects of anodal and cathodal tDCS reveal distinct functional roles for right parietal cortex in the detection of single and competing stimuli

Filmer, Hannah L., Dux, Paul E. and Mattingley, Jason B. (2015) Dissociable effects of anodal and cathodal tDCS reveal distinct functional roles for right parietal cortex in the detection of single and competing stimuli. Neuropsychologia, 74 120-126. doi:10.1016/j.neuropsychologia.2015.01.038


Author Filmer, Hannah L.
Dux, Paul E.
Mattingley, Jason B.
Title Dissociable effects of anodal and cathodal tDCS reveal distinct functional roles for right parietal cortex in the detection of single and competing stimuli
Journal name Neuropsychologia   Check publisher's open access policy
ISSN 1873-3514
0028-3932
Publication date 2015-07
Sub-type Article (original research)
DOI 10.1016/j.neuropsychologia.2015.01.038
Open Access Status
Volume 74
Start page 120
End page 126
Total pages 7
Place of publication Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2016
Language eng
Abstract Spatial attention can be used to direct neural processing resources to a subset of task-relevant or otherwise salient items within the environment. Such selective processes are particularly important for resolving competition between multiple stimuli. Deficits in processing single stimuli can arise after damage to parietal, frontal and temporal brain regions, as is typical in patients with contralesional spatial neglect. By contrast, deficits in processing multiple competing stimuli may arise specifically following lesions of the posterior parietal cortex (PPC), as occurs in the disorder of spatial extinction. It remains unclear, however, whether mechanisms involved in selecting single and competing stimuli reflect the same or dissociable neural operations within the PPC. To address this issue, in separate sessions, we applied transcranial direct current stimulation (tDCS) to the left or right PPC and measured the effect on detecting and discriminating single and competing visual stimulus events. Our results revealed reliable tDCS modulations of stimulus processing, specific to the right PPC, as well as a dissociation in the detection of single and competing stimuli. For the right PPC only, single stimuli presented to the left (contralateral) visual field were affected selectively by anodal tDCS, whereas competing stimuli across the two visual fields were affected by both anodal and cathodal tDCS. These contrasting effects of anodal and cathodal tDCS on perception of single and competing stimuli suggest dissociable neural coding properties within the right PPC.
Keyword Parietal cortex
Right hemisphere
Spatial attention
Transcranial direct current stimulation
Visual competition
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Brain Institute Publications
Official 2016 Collection
School of Psychology Publications
 
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