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@ARTICLE{Pool:840458,
author = {Pool, Eva-Maria and Leimbach, Martha and Binder, Ellen and
Nettekoven, Charlotte and Eickhoff, Simon and Fink, Gereon
R. and Grefkes, Christian},
title = {{N}etwork dynamics engaged in the modulation of motor
behavior in stroke patients},
journal = {Human brain mapping},
volume = {39},
number = {3},
issn = {1065-9471},
address = {New York, NY},
publisher = {Wiley-Liss},
reportid = {FZJ-2017-07974},
pages = {1078–1092},
year = {2018},
abstract = {Stroke patients with motor deficits typically feature
enhanced neural activity in several cortical areas when
moving their affected hand. However, also healthy subjects
may show higher levels of neural activity in tasks with
higher motor demands. Therefore, the question arises to what
extent stroke-related overactivity reflects
performance-level-associated recruitment of neural resources
rather than stroke-induced neural reorganization. We here
investigated which areas in the lesioned brain enable the
flexible adaption to varying motor demands compared to
healthy subjects. Accordingly, eleven well-recovered
left-hemispheric chronic stroke patients were scanned using
functional magnetic resonance imaging. Motor system activity
was assessed for fist closures at increasing movement
frequencies performed with the affected/right or
unaffected/left hand. In patients, an increasing movement
rate of the affected hand was associated with stronger
neural activity in ipsilesional/left primary motor cortex
(M1) but unlike in healthy controls also in
contralesional/right dorsolateral premotor cortex (PMd) and
contralesional/right superior parietal lobule (SPL).
Connectivity analyses using dynamic causal modeling revealed
stronger coupling of right SPL onto affected/left M1 in
patients but not in controls when moving the affected/right
hand independent of the movement speed. Furthermore,
coupling of right SPL was positively coupled with the
“active” ipsilesional/left M1 when stroke patients moved
their affected/right hand with increasing movement
frequency. In summary, these findings are compatible with a
supportive role of right SPL with respect to motor function
of the paretic hand in the reorganized brain.},
cin = {INM-3 / INM-7},
ddc = {610},
cid = {I:(DE-Juel1)INM-3-20090406 / I:(DE-Juel1)INM-7-20090406},
pnm = {572 - (Dys-)function and Plasticity (POF3-572)},
pid = {G:(DE-HGF)POF3-572},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:29193484},
UT = {WOS:000424804400002},
doi = {10.1002/hbm.23872},
url = {https://juser.fz-juelich.de/record/840458},
}