I do think there is a neurological basis for mystical experiences/psychosis (but then, there is for everything we experience, right?)
It's interesting because one of things that drove me to mytical aspects of religion are experiences I've had throughout my life where it feels suddenly as if I've been looking at my life from a distant point, but am suddenly and tangibly aware of myself as an actual living thing and not an actor on a stage. That is a poor way to describe it; it is frightening and euphoric all at once. And, to top it off, I do get panic attacks, though not as bad as I used to.
According to this, that would be a mystical psychosis, yes?
Of course, I use ritual in order to trigger a mystical experience, where I feel greater connection with my environment and lose myself in it. It feels different, but leads to the same outcome.
I've read studies where neurologists have located the part of the brain that becomes activated during the mystical experience and it appears to be related to something like a glitch in the part of the brain that defines ourselves from the surrounding environment.