= Electroencephalography
{title2=EEG}
{wiki}
<Electroencephalography> records differences in <electric potential> using <electrodes>, commonly at the scalp. Summed activity in neural <tissue> contributes to the measured signal, providing millisecond-scale information about changes over time.
An <event-related potential> compares or averages this activity relative to defined events. <Volume> conduction and overlapping sources limit direct localization, so a scalp waveform cannot simply be equated with one small neural generator.
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