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research article

Parietofrontal motor pathways and their association with motor function after stroke

Schulz, Robert
•
Koch, Philipp
•
Zimerman, Maximo
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2015
Brain : a journal of neurology

Corticocortical interactions between the primary motor cortex, the ventral premotor cortex and posterior parietal motor areas, such as the anterior and caudal intraparietal sulcus, are relevant for skilled voluntary hand function. It remains unclear to what extent these brain regions and their interactions also contribute to basic motor functions after stroke. We hypothesized that white matter integrity of the underlying parietofrontal motor pathways between these brain regions might relate to residual motor function after stroke. Twenty-five chronic stroke patients were recruited (aged 64 ± 8.8 years, range 46-75, 17 males, one left-handed) and evaluated 34 months after stroke (range 12-169 months) by means of grip force, pinch force and the Fugl-Meyer assessment of the upper extremity. Based on these measures, motor function was estimated applying a factor analysis with principal component extraction. Using diffusion tensor imaging and probabilistic tractography we reconstructed probable intrahemispheric trajectories between the primary motor cortex, the ventral premotor cortex and the anterior and caudal intraparietal sulcus in each patient. White matter integrity was estimated for each individual tract by means of fractional anisotropy. Generalized linear modelling was used to relate tract-related fractional anisotropy to the motor function. We found that the white matter integrity of the fibre tracts connecting the ventral premotor cortex and the primary motor cortex (P < 0.001) and the anterior intraparietal sulcus and the ventral premotor cortex (P < 0.01) positively correlated with motor function. The other tracts investigated did not show a similar structure-behaviour association. Providing first structural connectivity data for parietofrontal connections in chronic stroke patients, the present results indicate that both the ventral premotor cortex and the posterior parietal cortex might play a relevant role in generating basic residual motor output after stroke.

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Type
research article
DOI
10.1093/brain/awv100
Author(s)
Schulz, Robert
Koch, Philipp
Zimerman, Maximo
Wessel, Maximilian
Bönstrup, Marlene
Thomalla, Götz
Cheng, Bastian
Gerloff, Christian
Hummel, Friedhelm C
Date Issued

2015

Publisher

Oxford University Press

Published in
Brain : a journal of neurology
Volume

138

Issue

Pt 7

Start page

1949

End page

60

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
UPHUMMEL  
Available on Infoscience
December 23, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/132281
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