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Interhemispheric differences of sensory hand areas after monohemispheric stroke: MEG/MRI integrative study.

Abstract：

:Seventeen clinically stabilized monohemispheric stroke patients were studied in order to investigate the chronic topographical modifications induced on primary sensory cortical hand areas by a monohemispheric stroke within the middle cerebral artery territory. Magnetoencephalographic (MEG) localization of the cortical areas activated following electrical separate stimulation of the median nerve, thumb, and little fingers was integrated with magnetic resonance imaging. Spatial localization of Equivalent Current Dipoles (ECDs) of the short-latency cortical responses generated in primary sensory cortices, "hand area" (distance between 1st and 5th digits ECDs), interhemispheric differences of such parameters, as well as of somatosensory-evoked fields waveshapes were investigated and compared with a control population. Lesions involving the cortico-subcortical areas receiving sensory input from the hand induced excessive asymmetry of MEG spatial parameters and response morphology between the unaffected (UH) and the affected hemisphere (AH). "Hand area" was significantly larger on AH in 20% of cases after a subcortical, and in 13% after a cortical, lesion. Responses from AH were excessively delayed in 20% ECDs. Interhemispheric ECDs strength differences were larger than normal in 25% of cases after both types of lesions; the strength in the AH being enlarged after all cortical, and only 24% of subcortical strokes. In a significant percentage of monohemispheric strokes, excessive interhemispheric differences were found between AH and UH, suggesting that brain areas outside the normal boundaries and usually not reached by a dense sensory input from the opposite hand and fingers may act as somatosensory "hand" centers. Correlation analysis between clinical outcome and cortical reorganization in the AH suggests that this mechanism is linked with hand sensorimotor recovery.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Rossini PM,Tecchio F,Pizzella V,Lupoi D,Cassetta E,Pasqualetti P

doi

10.1006/nimg.2000.0686

keywords:

subject

Has Abstract

pub_date

2001-08-01 00:00:00

pages

474-85

issue

2

eissn

1053-8119

issn

1095-9572

pii

S1053811900906864

journal_volume

14

pub_type

杂志文章

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