Other Organs as Bioelectric Sources

EEG is recorded with three types of electrodes scalp, cortical, and depth. The electrical activity of 10 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 pV, and the frequency content 1—50 Hz, so DC 

The EEG signal can be time averaged based upon synchronization pulses from the stimulator. Electrical activity and the brain s electric response can by this method be extracted from noise. In this way, hearing sense of small children and babies can be examined. 

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