# Electroencephalography **Domain:** Neurophysiology / Neural Interfaces **Doc Type:** Scientific Concept Node **Maturity:** Established **Related:** [[Non-Invasive BCI]], [[BIDS-EEG]], [[Polysomnography]], [[DICOM Working Group 32]] --- ## Definition **Electroencephalography (EEG)** records voltage fluctuations at the scalp produced by coordinated neural activity. EEG offers millisecond-scale temporal resolution, relatively accessible hardware, and direct relevance to BCI control, sleep studies, epilepsy monitoring, evoked potentials, and longitudinal neurophysiology. ## Data requirements Interpretation depends on electrode montage and positions, reference scheme, sampling rate, impedance, vigilance state, filters, events, medications, and acquisition device. [[wiki/BIDS-EEG|BIDS-EEG]] and [[wiki/ISO-IEC TS 27571-2026|ISO/IEC TS 27571:2026]] address complementary parts of that descriptive structure.