What are the motifs in The Way of the Shaman by Michael Harner?

Shamanism as healing is a recurring idea in the book. As a supplement to Western medicine, shamanism contributes a direct way to access the body-mind connection for healing. A shaman is a type of medicine man who is a keeper of healing technique involving altered states of consciousness, self-sacrifice, and an ability to move at will between types of conscious states. Not all medicine men are shamans.