Attempts to manufacture isolation in the laboratory are even more disturbing. In the 1950s, Canadian psychologist Donald Hebb paid graduate students at McGill University $20 a day to stay alone in tiny rooms. The volunteers’ hands were placed in cardboard tubes, their ears covered by thick U-shaped pillows to muffle any sounds, and opaque goggles were placed over their eyes. Soon enough their mental cognition deteriorated and they experienced extreme restlessness and vivid hallucinations. One student reported feeling that his body was in two places at once, and he was unable to decide which one was really him.
— Read on www.wired.com/story/weird-science-of-loneliness-brains/