The slowest are delta waves at 1–4 hertz, which are associated with deep, unconscious, dreamless sleep. Theta waves are next at 4–8 hertz, associated with light sleep or meditation. Faster than alpha waves are the beta waves at 13–30 hertz, which the brain hits when it is wide awake. Believed to be most important for the brain’s ability to create consciousness are the fast gamma waves at 30–70 hertz, frequencies that just creep into the bottom range that my cello can play. Gamma waves are associated with the formation of ideas, language and memory processing, and with various types of
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hertz
