Yes definitely. Being a purist and using only one of those ranges exclusively is not very natural.
Anna Wise has determined a state of mind she calls The Awakened Mind which consists of all of those frequencies. Look at
http://www.annawise.com/the_work/
"The AWAKENED MIND brainwave pattern combines the intuitive, empathetic radar of the delta waves, the creative inspiration, personal insight, and spiritual awareness of the theta waves, the bridging capacity and relaxed, detached, awareness of the alpha waves, and the external attention and ability to consciously process thought of beta waves, all at the same time. It is a brainwave pattern shared by people in higher states of consciousness regardless of their philosophy, theology or meditation technique. This brainwave pattern can be found during “peak experience” and in all forms of creativity and high performance. The awakened mind is also the “ah-ha,” appearing at the exact instant of solving the problem, or getting the insight."
[This message has been edited by shr33m (edited December 04, 2003).]
