I might suggest you read Christof Koch, probably the preeminent neuroscientist today . Here's from a previous post of mine on Medium:

"He [Koch] acknowledges his own mystical experiences and in an interview published on Medium suggests that these experiences may prove a challenge to Integrated Information Theory or IIT (a future post will explore this theory in detail). However, in The Feeling of Life Itself when describing his own mystical experience he appears convinced that these experiences are produced by the brain:

'Mystical experience are not paranormal (or parapsychological) events, even though they are sometimes classified as such. They are veridical experiences that arise in a natural way from the brain.'"

The reason he was concerned that mystical experiences present a challenge to the physicalist belief that mind and experience emerges from the brain is that he has found that the most profound and vivid mystical experiences are reported when the neural correlates of consciousness which he studies are very quiet or inactive. How can this be?