Thirty Years Among the Dead

Wickland turned away from conventional medical psychology and toward the belief that psychiatric illnesses were the result of influence by spirits of the dead. Wickland came to believe that a large number of his patients had become possessed by what he called "obsessing spirits", and that low-voltage electric shocks could dislodge them, while his wife Anna acted as a medium to guide them to "progress in the spirit world". Spiritualists considered him an authority on "destructive spirits" and he wrote a book in 1924, Thirty Years Among the Dead, detailing his experiences as a psychical researcher.[3]

Wickland was convinced that he was in contact with a group of spirits known as the "Mercy Band" who would remove the possessors, and help them in the spirit world. Psychologist Robert A. Baker listed Wickland and Arthur Guirdham as early psychiatrists who preferred to "ignore the science and embrace the supernatural".[4]