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research article

Hand perceptions induced by single pulse transcranial magnetic stimulation over the primary motor cortex

Franza, Matteo
•
Sorrentino, Giuliana
•
Vissani, Matteo
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June 11, 2019
Brain Stimulation

Background When single pulse transcranial magnetic stimulation (TMS) is applied over the primary motor cortex (M1) with sufficient intensity, it evokes muscular contractions (motor-evoked potentials, MEPs) and muscle twitches (TMS-evoked movements). Participants may also report various hand sensations related to TMS, but the perception elicited by TMS and its relationship to MEPs and evoked movements has not been systematically studied. Objective The main aim of this work is to evaluate participants' kinesthetic and somatosensory hand perceptions elicited by single-pulse TMS over M1-hand area at different intensities of stimulation and their relation with MEPs and TMS-evoked movements. Methods We compared the number of MEPs (measured by electromyography), TMS-evoked movements (measured by an accelerometer) and participants' hand perception (measured by verbal report) elicited by TMS at different intensity of stimulation. This way, we estimated the amplitude of MEPs and the acceleration of TMS-evoked movements sufficient to trigger TMS evoked hand perceptions. Results We found that TMS-evoked hand perceptions are induced at 105% of the individual resting motor threshold, a value significantly different from the threshold inducing MEPs (about 100%) and TMS-evoked movements (about 110%). Our data indicate that only MEPs with an amplitude higher than 0.62 mV and TMS-evoked movements with acceleration higher than 0.42 m/s2 were associated with hand perceptions at threshold. Conclusions Our data reveal the main features of TMS-evoked hand perception and show that in addition to MEPs and TMS-evoked movements, this is a separate discernible response associated to single-pulse TMS over M1.

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Type
research article
DOI
10.1016/j.brs.2018.12.972
Author(s)
Franza, Matteo
Sorrentino, Giuliana
Vissani, Matteo
Serino, Andrea
Blanke, Olaf
Bassolino, Michela
Date Issued

2019-06-11

Published in
Brain Stimulation
Volume

12

Issue

3

Start page

693

End page

701

Subjects

Transcranial magnetic stimulation (TMS)Primary motor cortexMotor evoked potentialsTMS-evoked movementsTMS-evoked hand perceptionsAbsolute threshold

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LNCO  
CNP  
Available on Infoscience
April 16, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/156051
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