Question: what is alpha beta and delta?
Answer: Definitions. The EEG (electroencephalograph) measures brainwaves of different frequencies within the brain. ... The raw EEG has usually been described in terms of frequency bands: Gamma greater than 30(Hz) BETA (13-30Hz), ALPHA (8-12 Hz), THETA (4-8 Hz), and DELTA(less than 4 Hz).