The effects of rTMS and tDCS on the power and ERD of the mu wave

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We investigated the effects of repetitive transcranial magnetic stimulation (rTMS) and transcranial direct current stimulation (tDCS) on the mu wave. The power of the mu wave decreases with the imagination of movement or actual movement. This phenomenon is described as the desynchronization (ERD) of the mu wave. The aim of our study was to investigate the effects of different rTMS and tDCS stimulation parameters on the mu wave. We used rTMS and tDCS to either facilitate or inhibit cortical excitability. EEG was measured over the sensorimotor cortex before and after stimulation. We performed four stimulation trials with different stimulus conditions: (1) 1 Hz rTMS stimulation at 90% of the resting motor threshold (RMT), (2) 1 Hz rTMS stimulation at 110% RMT,; (3) anodal tDCS,; and (4) cathodal tDCS over the motor area of the thumb in the left hemisphere. During EEG recording, participants were asked to (1) maintain a resting state, (2) imagine moving their right hand, or (3) actually move their right hand. We assessed the power difference and the amount of relative ERD before and after stimulation. We found no significant change in the power of the mu wave before or after rTMS or tDCS. Anodal tDCS, which produces facilitation, produced a significant increase in ERD. Both 1 Hz rTMS at 110% of the RMT and cathodal tDCS, which produce inhibition, produced a significant decrease in ERD. We found no significant difference in ERD resulting from 1 Hz rTMS at 90% of the RMT.

Original languageEnglish
Pages (from-to)478-483
Number of pages6
JournalIEEJ Transactions on Fundamentals and Materials
Issue number9
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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