We know concretely that the brain transmits its own special brand of energy, called brain waves, which are associated with various states of consciousness. Interestingly, it is now the absence of these waves, rather than the cessation of the beating of the heart, that indicates clinical death.
TYPES OF BRAIN WAVES
DELTA
2-3.9 Hz
Deep sleep, unconsciousness
THETA
4-7-9 Hz
Deep meditation, sleep
ALPHA
8-12.9 Hz
Relaxation, meditation
BETA
13-30 Hz
Everyday activity
GAMMA
30+ Hz
