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Electroencephalography (EEG) was first used in humans by Hans Berger in 1924. The first report was published in 1929. It is a tracing of voltage fluctuations versus time recorded from multiple electrodes placed over the scalp in a specific pattern to sample different cortical regions. It represents fluctuating dendritic potentials from superficial cortical layers, which are recorded in an organized array pattern and require voltage amplification to be captured. Deep electrical activity of the brain is not well sampled in an EEG using ex