10.2. Other Organs as Bioelectric Sources
10.2.1. Brain (EEG, Electroencephalography)
EEG is recorded with three types of electrodes: scalp, cortical, and depth. The electrical activity of 1011 brain cells can be recorded on the skin of the scalp with a standardized electrode network of 21 electrodes. The leads may be bipolar or unipolar. The signal amplitude is only of the order of 50 μV, and the frequency content 1–50 Hz, so DC voltages are filtered out. The low-frequency content and the low amplitudes are a clear sign that the scalp has a detrimental effect on the signal transmission. Even so, the number of electrodes indicates that the information content is sufficient to roughly localize a source. It is believed that the brain centers are ...
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