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01-11-2006 | Research Article

Role of the right dorsal premotor cortex in “physiological” mirror EMG activity

Authors: F. Giovannelli, A. Borgheresi, F. Balestrieri, A. Ragazzoni, G. Zaccara, M. Cincotta, U. Ziemann

Published in: Experimental Brain Research | Issue 4/2006

Abstract

A distributed cortical network enables the lateralization of intended unimanual movements, i.e., the transformation from a default mirror movement to a unimanual movement. Little is known about the exact functional organization of this “non-mirror transformation” network. Involvement of the right dorsal premotor cortex (dPMC) was suggested because its virtual lesion by high-frequency repetitive transcranial magnetic stimulation (rTMS) increased the excitability of the left primary motor cortex (M1) during unilateral isometric contraction of a left hand muscle (Cincotta et al., Neurosci Lett 367: 189–93, 2004). However, no behavioural effects were observed in that experimental protocol. Here we tested behaviourally twelve healthy volunteers to find out whether focal disruption of the right dPMC by “off-line” One Hz rTMS (900 pulses, 115% of resting motor threshold) enhances “physiological” mirroring.This was measured by an established protocol (Mayston et al., Ann Neurol 45: 583–94, 1999) that quantifies the mirror increase in the electromyographic (EMG) level in the isometrically contracting abductor pollicis brevis (APB) muscle of one hand during brief phasic contractions performed with the APB of the other hand. Mirroring in the right APB significantly increased after real rTMS of the right dPMC. In contrast, no change in mirroring was seen with sham rTMS of the right dPMC, real rTMS of the right M1, or real rTMS of the left dPMC. These findings strongly support the hypothesis that the right dPMC is part of the non-mirror transformation cortical network.

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Title: Role of the right dorsal premotor cortex in “physiological” mirror EMG activity
Authors: F. Giovannelli
A. Borgheresi
F. Balestrieri
A. Ragazzoni
G. Zaccara
M. Cincotta
U. Ziemann
Publication date: 01-11-2006
Publisher: Springer-Verlag
Published in: Experimental Brain Research / Issue 4/2006
Print ISSN: 0014-4819
Electronic ISSN: 1432-1106
DOI: https://doi.org/10.1007/s00221-006-0581-9

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Role of the right dorsal premotor cortex in “physiological” mirror EMG activity

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