Shankar Vedantam found that a great deal of our thinking is shaped by our unconscious minds. Siri Husvedt's seizure disorder has led her to some concludions about the nature of the self and personal identity. Francis Crick lays out his "astonishing hypothesis," which is now the standard scientific view of consciousness. Alva Noe believes that we are not our brains. Don Lattin describes the history of the psychedelic movement of the 60's. Sonu Shamdasani talks about the extraordinary artwork in the "Red Book" and the issues Carl Jung used it to work through.