Wang, Ling E., Tittgemeyer, Marc, Imperati, Davide, Diekhoff, Svenja, Ameli, Mitra, Fink, Gereon R. ORCID: 0000-0002-8230-1856 and Grefkes, Christian ORCID: 0000-0002-1656-720X (2012). Degeneration of corpus callosum and recovery of motor function after stroke: A multimodal magnetic resonance imaging study. Hum. Brain Mapp., 33 (12). S. 2941 - 2957. HOBOKEN: WILEY-BLACKWELL. ISSN 1065-9471

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Abstract

Animal models of stroke demonstrated that white matter ischemia may cause both axonal damage and myelin degradation distant from the core lesion, thereby impacting on behavior and functional outcome after stroke. We here used parameters derived from diffusion magnetic resonance imaging (MRI) to investigate the effect of focal white matter ischemia on functional reorganization within the motor system. Patients (n = 18) suffering from hand motor deficits in the subacute or chronic stage after subcortical stroke and healthy controls (n = 12) were scanned with both diffusion MRI and functional MRI while performing a motor task with the left or right hand. A laterality index was employed on activated voxels to assess functional reorganization across hemispheres. Regression analyses revealed that diffusion MRI parameters of both the ipsilesional corticospinal tract (CST) and corpus callosum (CC) predicted increased activation of the unaffected hemisphere during movements of the stroke-affected hand. Changes in diffusion MRI parameters possibly reflecting axonal damage and/or destruction of myelin sheath correlated with a stronger bilateral recruitment of motor areas and poorer motor performance. Probabilistic fiber tracking analyses revealed that the region in the CC correlating with the fMRI laterality index and motor deficits connected to sensorimotor cortex, supplementary motor area, ventral premotor cortex, superior parietal lobule, and temporoparietal junction. The results suggest that degeneration of transcallosal fibers connecting higher order sensorimotor regions constitute a relevant factor influencing cortical reorganization and motor outcome after subcortical stroke. Hum Brain Mapp 33:2941-2956, 2012. (c) 2011 Wiley Periodicals, Inc.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Wang, Ling E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tittgemeyer, MarcUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Imperati, DavideUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Diekhoff, SvenjaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ameli, MitraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fink, Gereon R.UNSPECIFIEDorcid.org/0000-0002-8230-1856UNSPECIFIED
Grefkes, ChristianUNSPECIFIEDorcid.org/0000-0002-1656-720XUNSPECIFIED
URN: urn:nbn:de:hbz:38-477979
DOI: 10.1002/hbm.21417
Journal or Publication Title: Hum. Brain Mapp.
Volume: 33
Number: 12
Page Range: S. 2941 - 2957
Date: 2012
Publisher: WILEY-BLACKWELL
Place of Publication: HOBOKEN
ISSN: 1065-9471
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
VENTRAL PREMOTOR CORTEX; DIFFUSION-TENSOR; AXONAL DAMAGE; WALLERIAN DEGENERATION; MULTIPLE-SCLEROSIS; SUBCORTICAL STROKE; BRAIN-STIMULATION; WHITE-MATTER; SPINAL-CORD; INTERHEMISPHERIC COMMUNICATIONMultiple languages
Neurosciences; Neuroimaging; Radiology, Nuclear Medicine & Medical ImagingMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/47797

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