Hi Urza. Welcome to the forum.
I don't mean to sound condescending, but I recognize the possibility that I will anyway - so sorry in advance if I come across that way. The science behind what you are talking about is called Neurophysiology and there are a lot of very highly trained, highly skilled scientists and physicians exploring what you are talking about and have been since the late '60s.
Most of the research was started as a way to treat or cure epilepsy. EEG, Brain Mapping, Cortical Scanning, etc. all started out in epilepsy research. Much of the data was co-opted by other scientists and psychological researchers and turned into elements that made their way into pop psych. circles which were then re-co-opted by the New Age movement.
I take it you are NOT a Neurophysiologist - if you were, you'd be publishing papers on your studies in peer-reviewed AMA Journals rather than asking questions in public chat forums.
That being said, certainly the brain responds to wave energy - most effectively through sound or vision. That's why folks with epilepsy have to be careful about flashing lights and certain tones, lest they face inducing seizures. However, the mechanism behind this is extremely complex and doesn't fit into a "whole-brain/part-brain" kind of scenario you're envisioning.
If you are truly interested in this, take some time to do some research in some of the Medical Journals.
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