GENESIS: THE BACKROUND OF MY BIG QUESTION

Originally my "Big Question " was "what happens to our brain or during death ?" I started researching about the brain, then I ran across a article about brain washing which seemed a little bit more appealing. While researching about how the human brain can get brainwashed, which happens more more often then you think I watched a video about how the CIA would test pychedelics   on unbidden people to see if they can brain wash them. It's just as bad as it sounds. There are records of people committing suicide after being tested on and there are records of people that just plain we're never the same person. These people that were tested on unbidden went crazy. The sad thing is the CIA was" innocent"when charged with these accusations . Of course. Anyway, this is where my question comes from. "What is happening to our brain when psychedelics are taken?