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Effects of Coil Orientation on Motor Evoked Potentials From Orbicularis Oris

Adank, P; Meagherman, G; Hannah, R; Nuttall, H; (2018) Effects of Coil Orientation on Motor Evoked Potentials From Orbicularis Oris. Frontiers in Neuroscience , 12 , Article 683. 10.3389/fnins.2018.00683. Green open access

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Abstract

This study aimed to characterize effects of coil orientation on the size of Motor Evoked Potentials (MEPs) from both sides of Orbicularis Oris (OO) and both First Dorsal Interosseous (FDI) muscles, following stimulation to left lip and left hand Primary Motor Cortex. Using a 70 mm figure-of-eight coil, we collected MEPs from eight different orientations while recording from contralateral and ipsilateral OO and FDI using a monophasic pulse delivered at 120% active motor threshold. MEPs from OO were evoked consistently for six orientations for contralateral and ipsilateral sites. Contralateral orientations 0°, 45°, 90°, and 315° were found to best elicit OO MEPs with a likely cortical origin. The largest FDI MEPs were recorded for contralateral 45°, invoking a posterior–anterior (PA) current flow. Orientations traditionally used for FDI were also found to be suitable for eliciting OO MEPs. Individuals vary more in their optimal orientation for OO than for FDI. It is recommended that researchers iteratively probe several orientations when eliciting MEPs from OO. Several orientations likely induced direct activation of facial muscles.

Type: Article
Title: Effects of Coil Orientation on Motor Evoked Potentials From Orbicularis Oris
Open access status: An open access version is available from UCL Discovery
DOI: 10.3389/fnins.2018.00683
Publisher version: http://doi.org/10.3389/fnins.2018.00683
Language: English
Additional information: © 2018 Adank, Kennedy-Higgins, Maegherman, Hannah and Nuttall. This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/).
Keywords: transcranial magnetic stimulation, motor cortex, facial muscle, hand muscle, motor evoked potentials, coil orientation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Speech, Hearing and Phonetic Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10055803
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