Theta waves are very slow, and as such are associated with deep relaxation. We typically drop into the theta state when we are totally chilled out, before going to sleep or when we are meditating.
To quote author Michael Hutchison, the theta state is often “indicative of deep reverie, mental imagery, and access to memories”. It could be said that the theta state is akin to dreaming while awake.
Like the currents of electrical devices, brain waves are measured in hertz. The theta zone is between 4 and 7 Hz. The only state slower than this is the state of delta brain waves – which are produce in abundance when we are in deep sleep.
Technically, we can not hear Theta brain waves. Jose Silva developed an auditory interpretation of the Theta Sound. It is his concept, so have fun and enjoy your experience of using the Theta sound as a background sound to facilitate a deep relaxation during your meditation.
Theta is the state of relaxation, and really is a wonderful realm to slip into and escape the world. When the brain is producing theta brain waves in abundance you will feel deeply relaxed.
It's a neutral zone where the mind is present in the moment, attached to nothing and totally centered.
Dr Thomas Budzynski, one of the world's foremost authorities on bio-feedback, states that theta can induce “a sensation of detached relaxation with results ranging from drowsy, like states, to vivid, holograph-like images”.