Ah. I did some research on that quite a few years ago. Was briefly a purveyor of knowledge in that area.
What seems to happens is there's a different stages. My personnel research was leading to different parts of the brain almost seem to wake up. I found that it also depended a bit on posture, poses, and experience kinds of stuff.
A few observations from my pre-grad-pls-take-me for Sand Diago State and stanford:
It seemed as if different parts of the brain would engage and wake up depending on what Mudra and Mantras were used. For example someone training in Kung Fu, in the Heart Sutra- it wasn't unusual for the front parts of the brain to wake up. Interestingly Zen practices seemed to engage areas related to memory.
What baffled me though was how 'Jedi' practices were arousing- yet those subjects showed even brainwave levels. I don't know if the papers are still on PubMed.-there were a few reports from Phil Jackson's time with the bulls.One IIRC was "Phil Jackson: Meditation, imagery and success" IIRC he also comented in a book "Imagery and Success" . Basicly oddly, he had his team go through some zen practices, and jedi practices (yes that amused me)- sufficed to say when they read players such as Kobe Bryant, They had fairly even brain waves, but the part of the brain related to dreaming and imagery were relatively active-despite being relatively calm.
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