What is the role of transcranial electrical stimulation (TES) in motor evoked potentials (MEPs)?

Updated: Aug 20, 2019
  • Author: Jasvinder Chawla, MD, MBA; Chief Editor: Selim R Benbadis, MD  more...
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After skin preparation with acetone, stimulation is performed using cutaneous electrodes. Specific montages allow preferential stimulation of specific muscle groups. For example, motor evoked potentials (MEPs) are induced preferentially in hand muscles if the anode is placed 7cm away from the vertex, on the line joining the vertex to the tragus, and the cathode is placed over the vertex.

TES cannot stimulate individual muscles selectively. Conversely, TMS can stimulate discrete muscles or muscle groups preferentially. Responses in TES are recorded in target muscles with surface or coaxial electrodes, as in TMS.

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