--Rob Dickens, PsyPressUK.com Review, December 2010
PIT suggests many rich opportunities for research that are bound to reveal pragmatic and novel applications. Not since The Invisible Landscape have I found a book so original and propitious.
--Jedi Mind Traveler, Evolver.net interview, January 2011
PIT is the everyman's guide to inner consciousness, unraveling the scientific foundations of altered states. Kent's reductionist approach also leaves room for mysteries to grow.
--Rak Razam, author of Aya: A Shamanic Odyssey, November 2010
Kent's clear trail through volumes of research gave me a solid understanding of hallucinatory states. Kent deserves a place next to Grof on the psychonaut's bookshelf.
--Sheldon Norberg, author of Healing Houses, Erowid.org Review, October 2010
PIT is an extraordinary book. I love it and believe it is a special book that over the years will increasingly emerge as important to our field.
--Neal Marshall Goldsmith, author of Psychedelic Healing, January 2011