A pioneering and revolutionary book that lays the foundation for a radical new psychology, based on an expanded cartography of the human unconsciousness. Famous for his lifelong research into psychedelic drugs, Dr. Grof constructs a comprehensive and helpful framework out of the broad range of experiences triggered by LSD in patients and research subjects. Current research into the brain and ways of expanding consciousness give this seminal book, first published in 1979, new importance for the light it throws on many fundamental, but hitherto mysterious, human potentialities. Grof's theory of the human psyche transcends the personal and opens ways to a greater understanding of our inner selves.