I recently watched a talk by a brain scientist who suffered a stroke that caused the left side of her brain to temporarily ‘shut down’. With only her right brain functioning, she described how she felt one with the universe… and could no longer relate to the notion of a self identity ( ” I “) or even the boundary of her own physical body.
The description resembled the descriptions of ‘Brahman’, the universal soul etc that one finds in the Upanishads.
Eventually, the study of consciousness, mental processes etc might finally lead science to a the same point that religion/metaphysics reached thousands of years ago. I’m copy pasting the transcript of the talk i referred to.
To read the transcript or view the video of the talk, go here: Stroke of insight: by Jill Bolte