Universität zu Köln

Pool, Eva-Maria ORCID: 0000-0001-8007-9588, Rehme, Anne K., Fink, Gereon R. ORCID: 0000-0002-8230-1856, Eickhoff, Simon B. ORCID: 0000-0001-6363-2759 and Grefkes, Christian ORCID: 0000-0002-1656-720X (2014). Handedness and effective connectivity of the motor system. Neuroimage, 99. S. 451 - 461. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1095-9572

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Abstract

Handedness denotes the individual predisposition to consistently use the left or right hand for most types of skilled movements. A putative neurobiological mechanism for handedness consists in hemisphere-specific differences in network dynamics that govern unimanual movements. We, therefore, used functional magnetic resonance imaging and dynamic causal modeling to investigate effective connectivity between key motor areas during fist closures of the dominant or non-dominant hand performed by 18 right- and 18 left-handers. Handedness was assessed employing the Edinburgh-Handedness-Inventory (EHI). The network of interest consisted of key motor regions in both hemispheres including the primary motor cortex (M1), supplementary motor area (SMA), ventral premotor cortex (PMv), motor putamen (Put) and motor cerebellum (Cb). The connectivity analysis revealed that in right-handed subjects movements of the dominant hand were associated with significantly stronger coupling of contralateral (left, i.e., dominant) SMA with ipsilateral SMA, ipsilateral PMv, contralateral motor putamen and contralateral M1 compared to equivalent connections in left-handers. The degree of handedness as indexed by the individual EHI scores also correlated with coupling parameters of these connections. In contrast, we found no differences between right- and left-handers when testing for the effect of movement speed on effective connectivity. In conclusion, the data show that handedness is associated with differences in effective connectivity within the human motor network with a prominent role of SMA in right-handers. Left-handers featured less asymmetry in effective connectivity implying different hemispheric mechanisms underlying hand motor control compared to right-handers. (C) 2014 Elsevier Inc All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Pool, Eva-Maria UNSPECIFIED orcid.org/0000-0001-8007-9588 UNSPECIFIED Rehme, Anne K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fink, Gereon R. UNSPECIFIED orcid.org/0000-0002-8230-1856 UNSPECIFIED Eickhoff, Simon B. UNSPECIFIED orcid.org/0000-0001-6363-2759 UNSPECIFIED Grefkes, Christian UNSPECIFIED orcid.org/0000-0002-1656-720X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-428225
DOI:	10.1016/j.neuroimage.2014.05.048
Journal or Publication Title:	Neuroimage
Volume:	99
Page Range:	S. 451 - 461
Date:	2014
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 CEREBRAL-BLOOD-FLOW; BASAL GANGLIA; HEMISPHERIC-ASYMMETRY; PREFRONTAL CORTEX; FINGER MOVEMENTS; PREMOTOR CORTEX; FRONTAL-LOBE; FUNCTIONAL-ORGANIZATION; NETWORK CONNECTIVITY; CEREBELLAR LOOPS Multiple languages Neurosciences; Neuroimaging; Radiology, Nuclear Medicine & Medical Imaging Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42822