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Meditation

Brainwave Entrainment

Entraining the brain to a desired state

The effect of the audible frequencies used

Altered brain states

Helping in meditation

Reducing learning time

Reducing sleep needs

Treatment of certain mental diseases

Subliminal Information Processing (SIP)
Brainwave Entrainment

EEG and the Brain's State

EEG (Electroencephalography) technology is used to measure brain's electrical vibrations from the surface of the scalp. The resulting EEG pattern will contain frequency elements mainly below 30Hz. The frequencies are categorized into four states as follows:

State Frequency Range State of Mind
Delta 0.5 Hz - 4 Hz Deep Sleep
Theta 4 Hz - 8 Hz Drowsiness (also first stage of sleep)
Alpha 8 Hz - 14 Hz Relaxed but Alert
Beta 14 Hz - 30 Hz Highly alert and focused

The dominant frequency in the EEG pattern determines what shall be called the current state of the brain. If the amplitude of the alpha range frequencies is highest, then the brain is said to be in the alpha stage. Note that other frequencies still exist and it is impossible to give any "exact frequency your brain is operating on."

However, later references to the brain states use the simplification of assuming that such a single frequency exists.