MEG/EEG signals

Both magnetoencephalography (MEG) and electroencephalogram (EEG) are the functional imaging techniques to measure the brain activity with a very high temporal resolution at the msec level. Both techniques are complementary. They investigate the brain activities from the different angles. MEG tests the magnetic fields and EEG tests the potentials from the scalp.

EEG is a traditional technique. Most of Brain computation interface applications used EEG. The use of high density EEG mapping becomes more and more popular, which definitely helps the improvement of source localization. Compared with EEG, MEG has the advantages of reference-free, no influences from the skull and other tissues, and higher accuracy of localizing sources.