This is interesting. Now I’m wondering …
What is the connection between brain and jhana? Indeed is there one?
Does one need a brain to do jhana?
Does a deva have more brain material than a human or less?
Why do some of the deva realms correspond to different jhana attainments?
Could it be that the brain acts like a filter on the mind preventing clear seeing?
Does shutting down the brain result in clear seeing?
Is this why Near Death Experiences are sometimes said to be similar to jhana?
And finally if metabolism does stop in jhana, then the ‘active’ (i.e. neurons firing) brain also presumably stops - see:
Interesting stuff.