Beta: above 14cps, typically 20 cps when body and mind are active and eyes focused
between 12-30Hz (wikipedia)
Alpha: 7-14 cps, associated with light sleep and dreaming
8-12 Hz (wikipedia)
Theta: 4-7 cps, associated with deeper sleep, hypnotized state
6-10 Hz (wikipedia)
Delta: less than 4 cps, associated with deepest sleep
1-4 Hz (wikipedia)
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