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Updated: Jul 31, 2026
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Extracting Visual Evoked Potentials from EEG Data Recorded During fMRI-guided Transcranial Magnetic Stimulation
Published on: May 12, 2014
EEG modification induced by repetitive transcranial magnetic stimulation
H Okamura1, H Jing, M Takigawa
1Department of Neuropsychiatry, Faculty of Medicine, Kagoshima University, Kagoshima City, Japan.
Summary
Repetitive transcranial magnetic stimulation (rTMS) significantly alters electroencephalography (EEG) power spectrum, increasing frequency and amplitude. This noninvasive brain stimulation technique offers insights into cortical activity and brain function.
Area of Science:
- Neuroscience
- Cognitive Science
- Biomedical Engineering
Background:
- Repetitive transcranial magnetic stimulation (rTMS) is a noninvasive brain stimulation technique.
- Investigating cortical physiologic functions using rTMS is crucial.
- EEG spectral analysis has not been extensively studied in conjunction with rTMS.
Purpose of the Study:
- To investigate the influence of rTMS on the EEG power spectrum.
- To explore changes in cortical activity following rTMS of the left frontal cortex.
Main Methods:
- rTMS applied to the left frontal cortex in 32 healthy subjects.
- Stimulation parameters: 10-Hz frequency, 3-second duration, 100% motor threshold.
- EEG spectral analysis conducted before, during, and after stimulation and sham stimulation.
Main Results:
- rTMS increased EEG peak frequency across the scalp within 2 minutes post-stimulation.
- EEG peak frequency decreased between 3 to 4 minutes post-stimulation.
- Mean absolute EEG power increased at 4 to 5 minutes post-rTMS, with no significant change after sham stimulation.
Conclusions:
- rTMS significantly influences cortical activities by altering EEG frequency and amplitude.
- rTMS is a valuable tool for understanding brain functions.
- EEG spectral analysis can effectively detect rTMS-induced changes in brain activity.
