Electroencephalography (EEG)
A non-invasive neurophysiological technique measuring electrical brain activity using surface scalp electrodes.
Governing formula
Frequency Bands: Delta (1–4Hz), Theta (4–8Hz), Alpha (8–12Hz), Beta (12–30Hz)
SI unit
μV (Microvolts ~10–100 μV) & Hz
In depth
Detects summed postsynaptic dendritic potentials from thousands of synchronized cortical pyramidal neurons. Categorized into frequency bands (Delta, Theta, Alpha, Beta, Gamma).
Examples in the real world
EEG monitoring diagnosing epilepsy seizure activity and evaluating sleep stage disorders.