Meditation and Frequency

What's the relationship between meditation and frequency and why do we practice meditation to get our awareness?

We discuss four types of frequency here.

Beta wave is the term used to designate the frequency range of human brain activity between 12 and 30 Hz (12 to 30 transitions or cycles per second).(*1)
This wave is happened on our activities.

Alpha wave is neural oscillation in the frequency range of 8–12 Hz arising from synchronous and coherent (in phase/constructive) electrical activity of thalamic pacemaker cells in humans.(*2)
This wave is happened when we are wakeful relaxation with closed eyes


Theta wave (4-7 Hz) is an oscillatory pattern in EEG (Electroencephalography) signals recorded either from inside the brain or from electrodes glued to the scalp. (*3)
This wave is happened on the first stage of sleeping and dreaming.

Delta wave is a high amplitude brain wave with a frequency of oscillation between 0–4 hertz. (*4)
This wave is happened during deep sleeping (sleepwalking, sleeptalking, etc.)

The fast waves (like beta waves) match to the consciousness of daily and busy mind. We have our egos during beta waves.
We feel less worried and open ourselves more when we reduce brain waves to alpha.
As our brain waves slow to theta, we find true selves.

Practicing meditation is for reducing our brain waves and wake up/find our awareness.

*1: http://en.wikipedia.org/wiki/Beta_wave
*2: http://en.wikipedia.org/wiki/Alpha_wave
*3: http://en.wikipedia.org/wiki/Theta_wave
*4: http://en.wikipedia.org/wiki/Delta_wave