Lately, I have an interest in unusual claims made in the field of psychology, for it seems to me that at least some of these claims are well founded--arguably, more well founded than Fortean claims in other fields. I got this book from a used bookstore in my neighborhood.
This book, first published in 1969, is a collection of readings about altered states of consciousness. Some of the papers report quantitative information, such as an electroencephalograhic study of Yogis. However, other papers, usually the older ones, are more like a personal essay. For example, the philosopher William James writes about his experience under the influence of nitrous oxide.
Here are some claims I came across in this book which I found fascinating:
--- Rachmaninoff, in order to deal with depression, saw a therapist who specialized in hypnotic treatments. Rachmaninoff was told under hypnotic suggestion to write music and work with great facility. Rachmaninoff's gloom evaporated and he wrote Concerto Number Two in C Minor for Piano and Orchestra.
--- Two Yogis were able to keep a hand in ice cold water for 44-55 minutes without experiencing any discomfort.
--- The Senoi, a tribe which lives in the Malay Peninsula, claims that there has been no violent crime or an intercommunal conflict in 200-300 years. They credit this to a psychotherapy of dream interpretation which is an integral part of their society.
The book also contains an impressive list of References. I find it exciting to think that further research has gone on since the time when this book was first published, and that there is still much to be explored.