Universität zu Köln

Vossel, Simone ORCID: 0000-0002-6351-8849, Weidner, Ralph ORCID: 0000-0002-4502-0166, Moos, Katharina and Fink, Gereon R. ORCID: 0000-0002-8230-1856 (2016). Individual attentional selection capacities are reflected in interhemispheric connectivity of the parietal cortex. Neuroimage, 129. S. 148 - 159. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1095-9572

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Abstract

Modelling psychophysical data using the Theory of Visual Attention (TVA) allows for a quantification of attentional sub-processes, such as the resolution of competition amongst multiple stimuli by top-down control signals for target selection (TVA-parameter alpha). This fMRI study investigated the neural correlates of alpha by comparing activity differences and changes of effective connectivity between conditions where a target was accompanied by a distractor or by a second target. Twenty-five participants performed a partial report task inside the MRI scanner. The left angular gyrus (ANG), medial frontal, and posterior cingulate cortex showed higher activity when a target was accompanied by a distractor as opposed to a second target. The reverse contrast yielded activation of a bilateral fronto-parietal network, the anterior insula, anterior cingulate cortex, and left inferior occipital gyrus. A psychophysiological interaction analysis revealed that the connectivity between left ANG and the left and right supramarginal gyrus (SMG), left anterior insula, and right putamen was enhanced in the target-distractor condition in participants with worse attentional top-down control. Dynamic causal modelling suggested that the connection from left ANG to right SMG during distractor presence was modulated by alpha. Our data show that interindividual differences in attentional processing are reflected in changes of effective connectivity without significant differences in activation strength of network nodes. (C) 2016 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Vossel, Simone UNSPECIFIED orcid.org/0000-0002-6351-8849 UNSPECIFIED Weidner, Ralph UNSPECIFIED orcid.org/0000-0002-4502-0166 UNSPECIFIED Moos, Katharina UNSPECIFIED UNSPECIFIED UNSPECIFIED Fink, Gereon R. UNSPECIFIED orcid.org/0000-0002-8230-1856 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-280667
DOI:	10.1016/j.neuroimage.2016.01.054
Journal or Publication Title:	Neuroimage
Volume:	129
Page Range:	S. 148 - 159
Date:	2016
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication:	SAN DIEGO
ISSN:	1095-9572
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRANSCRANIAL MAGNETIC STIMULATION; VISUAL-ATTENTION; BUNDESENS THEORY; DEFICITS; MODULATION; MECHANISMS; SEARCH; TVA; TPJ Multiple languages Neurosciences; Neuroimaging; Radiology, Nuclear Medicine & Medical Imaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28066