For your pleasure..
I don't know what to think about this yet. They did make a valid points about it being another gateway to harder drugs.
Frequency range Name Usually associated with: > 40 Hz Gamma waves Higher mental activity, including perception, problem solving, fear, and consciousness 13–39 Hz Beta waves Active, busy or anxious thinking and active concentration, arousal, cognition 7–13 Hz Alpha waves Relaxation (while awake), pre-sleep and pre-wake drowsiness 4–7 Hz Theta waves Dreams, deep meditation, REM sleep < 4 Hz Delta waves Deep dreamless sleep, loss of body awareness