: Discernible waveforms are generated by measuring the voltage difference between two electrode sites using a differential amplifier.
: EEG measures the collective electrical activity of about 100,000 neurons, which create recordable voltage differences at the scalp. Electroencephalography : basic principles, clin...
: Electrodes are typically placed according to the International 10-20 system, with "montages" used to compare signals across different brain regions (e.g., frontal, temporal, parietal). Standard Brain Wave Patterns EEG (electroencephalogram) - Mayo Clinic : Discernible waveforms are generated by measuring the