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@ARTICLE{Pool:153969,
author = {Pool, Eva-Maria and Rehme, Anne K. and Fink, Gereon R. and
Eickhoff, Simon and Grefkes, Christian},
title = {{H}andedness and effective connectivity of the motor
system},
journal = {NeuroImage},
volume = {99},
issn = {1053-8119},
address = {Orlando, Fla.},
publisher = {Academic Press},
reportid = {FZJ-2014-03402},
pages = {451–460},
year = {2014},
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.},
cin = {INM-1 / INM-3},
ddc = {610},
cid = {I:(DE-Juel1)INM-1-20090406 / I:(DE-Juel1)INM-3-20090406},
pnm = {333 - Pathophysiological Mechanisms of Neurological and
Psychiatric Diseases (POF2-333) / 89571 - Connectivity and
Activity (POF2-89571)},
pid = {G:(DE-HGF)POF2-333 / G:(DE-HGF)POF2-89571},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000339860000045},
pubmed = {pmid:24862079},
doi = {10.1016/j.neuroimage.2014.05.048},
url = {https://juser.fz-juelich.de/record/153969},
}