This is a pioneering cognitive psychological study of Ayahuasca, a plant-based Amazonian psychotropic brew. The author presents a comprehensive charting of the various facets of the special state of mind induced by Ayahuasca, and analyzes them from a cognitive psychological perspective. In addition to its being the most thorough study of the Ayahuasca experience to date, this book lays the theoretical foundations for the psychological study of non-ordinary states of consciousness in general.