Psychedelic Information Theory: Shamanism in the Age of Reason is a formal analysis of the physical mechanisms underlying hallucination, shamanic ritual, and expanded states of consciousness. Written by James L. Kent, this text was researched for over 20 years and includes over 200 references and 31 images related to the latest science in the diverse fields of pharmacology, shamanism, and perception. As a succinct yet comprehensive formal analysis of the dynamics of hallucination and shamanic ritual, Psychedelic Information Theory is destined to become the modern textbook on psychedelic phenomena. Chapters include information on the physiology of perception, types of visual hallucination, psychedelic pharmacology, psychedelic neuroplasticity, chaos theory, shamanic therapy, shamanic sorcery, and group mind phenomena related to psychedelic consciousness.