It really isn't new-agey. Brain waves certainly exist, can certainly be measured, and the presence or absence of certain frequency bands is certainly relevant to various brain functions (EG ~40Hz alpha waves and being conscious). There really is evidence that certain groupings of neurons act like band pass filters, and that something similar to the frequency tricks of old telephone equipment is used in the brain to pass multiple messages to different recipients while using the same neural "wire".
Furthermore, the brain is far to wet and warm for quantum mechanics to be relevant. Coherence times would suck.
Furthermore, the brain is far to wet and warm for quantum mechanics to be relevant. Coherence times would suck.