Towards a Brain-Sensitive Intelligent Tutoring System: Detecting Emotions from Brainwaves

Table 1

Brainwaves and mental states.

Wave	Frequency	Mental state
Delta	0–4 Hz	Deep sleep; hypnosis; increasing immune functions; physical and mental restructuring.
Theta	4–8 Hz	Deep relaxation; state of meditation; increase in creativity
Alpha	8–12 Hz	Mental and muscular relaxation; positive thought; improved memory; assimilation and capacity for study. Improved performance in sport.
Beta	>12 Hz	Relaxed focus; improved attention; conscious attention, tension anxiety-stress; confusion; irritability; psychosomatic problems