The brain

[Angrboda]

Since Schwartz explicitly brings up the subject of his experiments with mediums in the video, I think the following is relevant. The points made in the article may not all obtain, but I think the flaws in his work justify discounting his claims about mediums and their ability to speak to the dead.

Professor Gary Schwartz makes revolutionary claims that he has provided competent scientific evidence for survival of consciousness and—even more extraordinary—that mediums can actually communicate with the dead. He is badly mistaken. The research he presents is flawed, and in numerous ways. Probably no other extended program in psychical research deviates so much from accepted norms of scientific methodology as this one.

How Not to Test Mediums: Critiquing the Afterlife Experiments