Table 1: Brainwaves and mental states.

WaveFrequencyMental state

Delta0–4 HzDeep sleep; hypnosis; increasing immune functions; physical and mental restructuring.
Theta4–8 HzDeep relaxation; state of meditation; increase in creativity
Alpha8–12 HzMental and muscular relaxation; positive thought; improved memory; assimilation and capacity for study. Improved performance in sport.
Beta>12 HzRelaxed focus; improved attention; conscious attention, tension anxiety-stress; confusion; irritability; psychosomatic problems