Time course of cortical plasticity after facial nerve palsy: a single-case study.

Abstract:

BACKGROUND:Functional connectivity is defined as the temporal correlation between spatially remote neurophysiological events. This method has become particularly useful for studying neuroplasticity to detect changes in the collaboration of brain areas during cortical reorganization. METHODS:In this article, the authors longitudinally studied voxel-based morphometry and resting state functional magnetic resonance imaging 10 times in 1 patient during the course of Bell palsy (idiopathic facial nerve palsy) up to complete clinical recovery. RESULTS:Morphometric analysis revealed a significant alteration in the face area of the primary motor cortex (M1) contralateral to the paretic face, with an initial increase in gray matter concentration. Functional connectivity analysis between the M1 and other parts of the facial motor network revealed acutely disrupted intrahemispheric connectivity but unaltered interhemispheric connectivity. The disrupted functional connectivity was most pronounced on the day of the onset of symptoms, with a subsequent return toward normal during the course of recovery. This time course was found to differ between the selected parts of the facial motor network. However, the increase in functional connectivity strength preceded clinical recovery in all areas and reached a stable level before the patient fully recovered. CONCLUSION:These results demonstrate that recovery from facial nerve palsy is complemented by cortical reorganization, with pronounced changes of functional connectivity that precede clinical recovery.

authors

Klingner CM,Volk GF,Brodoehl S,Burmeister HP,Witte OW,Guntinas-Lichius O

doi

10.1177/1545968311418674

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

197-203

issue

2

eissn

1545-9683

issn

1552-6844

pii

1545968311418674

journal_volume

26

pub_type

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