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.
A sustained lateralized electrophysiological signal during visual-memory delays, typically measured as a difference between signals contralateral and ipsilateral to the attended visual field. Its load dependence and relation to behavioral capacity constrain models without fixing a universal storage count.
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Electroencephalography (EEG) is a medical diagnostic technique that records electrical activity in the brain using electrodes placed on the scalp. These electrodes detect and measure the electrical impulses produced by neuronal activity. EEG is useful for diagnosing various neurological conditions, such as epilepsy, sleep disorders, and brain tumors, as well as for monitoring brain activity during surgeries or in intensive care settings. The recorded data is displayed as waveforms and can be analyzed for patterns that may indicate abnormal brain activity.