In this revised edition of his revolutionary study, Ornstein reexamines what is known about consciousness today through a consideration of intuition and reason.

Summarizes Grof's experiences and observations from more than forty years of research into non-ordinary states of consciousness. This accessible and comprehensi

A leader in transpersonal psychology presents the first truly integrative model of spiritual consciousness and Western developmental psychology The goal of an �

Based on his life's research, Robert Ornstein provides a look at the evolution of the mind. He explains that we are not rational but adaptive, and that it is Da