Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/109513
Title: Modulation of cortical interhemispheric interactions by motor facilitation or restraint
Authors: Vidal, Ana Cristina
Banca, Paula 
Pascoal, Augusto Gil
Cordeiro, Gustavo 
Sargento-Freitas, João 
Castelo-Branco, Miguel 
Issue Date: 2014
Publisher: Hindawi
Project: SFRH/BD/63848/2009 
CENTRO- 07-ST24-FEDER-00205 
PEst-C/SAU/UI3282/2013 
Serial title, monograph or event: Neural Plasticity
Volume: 2014
Abstract: Cortical interhemispheric interactions in motor control are still poorly understood and it is important to clarify how these depend on inhibitory/facilitatory limb movements and motor expertise, as reflected by limb dominance. Here we addressed this problem using functional magnetic resonance imaging (fMRI) and a task involving dominant/nondominant limb mobilization in the presence/absence of contralateral limb restraint. In this way we could modulate excitation/deactivation of the contralateral hemisphere. Blocks of arm elevation were alternated with absent/present restraint of the contralateral limb in 17 participants. We found the expected activation of contralateral sensorimotor cortex and ipsilateral cerebellum during arm elevation. In addition, only the dominant arm elevation (hold period) was accompanied by deactivation of ipsilateral sensorimotor cortex, irrespective of presence/absence of contralateral restraint, although the latter increased deactivation. In contrast, the nondominant limb yielded absent deactivation and reduced area of contralateral activation upon restriction. Our results provide evidence for a difference in cortical communication during motor control (action facilitation/inhibition), depending on the "expertise" of the hemisphere that controls action (dominant versus nondominant). These results have relevant implications for the development of facilitation/inhibition strategies in neurorehabilitation, namely, in stroke, given that fMRI deactivations have recently been shown to reflect decreases in neural responses.
URI: https://hdl.handle.net/10316/109513
ISSN: 2090-5904
1687-5443
DOI: 10.1155/2014/210396
Rights: openAccess
Appears in Collections:I&D IBILI - Artigos em Revistas Internacionais

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