Electro-encephalograms (EEGs) are recordings of the minute (generally less than 300 mV) electrical potentials

produced by the brain. Since 1924, when Hans Berger reported the measurements of rhythmic electrical

activity on the human scalp, it has been suggested that these patterns of bioelectrical origin may provide clues

regarding the neuronal bases for specific behaviors and has offered great promise to reveal correlations

between pathological processes and the electrical activity of specific regions of the brain.