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Improved reproducibility of magnetic stimulation-evoked motor potentials in the human masseter by a new method for locating stimulation sites on the scalp

Lookup NU author(s): Professor John-Paul TaylorORCiD


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In magnetic-stimulation studies where motor-evoked potentials (MEP) are measured on different occasions, accurate relocation of the stimulation site on the scalp is essential. Here a novel method of locating neural stimulation sites was tested and the reproducibility of MEPs in the human masseter assessed. The heads of the participants were immobilized in a plastic mask that incorporated a grid overlying the left cerebral hemisphere. A figure-of-eight coil was oriented with a micromanipulator. Electrodes were placed over the right masseter using a standardized method. Two discrete sites on the grid were stimulated alternately at threshold +10% whilst participants clenched their teeth. Recordings were repeated after the mask and electrodes had been removed and replaced. Within individual participants, the latency and amplitude of the MEP were reproducible between trials and when the mask and electrodes were replaced. The new method appears to be accurate and practical when recording longitudinal MEP data in the masseter.

Publication metadata

Author(s): McMillan AS, Watson C, Walshaw C, Taylor JP

Publication type: Article

Publication status: Published

Journal: Archives of Oral Biology

Year: 1998

Volume: 43

Issue: 8

Pages: 665-668

Print publication date: 01/08/1998

ISSN (print): 0003-9969

ISSN (electronic): 1879-1506

Publisher: Pergamon


DOI: 10.1016/S0003-9969(98)00050-8

Notes: published erratum appears in Archives of Oral Biology 1999;44:296


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