I really enjoyed this book. I had seen bits and pieces from it on the net for a few years, PIT has been long in gestation.
It's not perhaps the 'Ultimate Resource Book' though. It takes a very rational top down approach to explaining what might be happening when you are having a psychedelic experience.
Using wave theory, James L. Kent suggests that one's seamless experience of normal reality is created by gating mechanisms and the resonances of brain wave patterns. I think he postulates that psychedelic drugs inhibit the negative feedback mechanisms which usually modulate the focal point of awareness so that novel patterns of thought enter into it.
He does not claim his theories as fact, but presents them as (very appealing) hypothesis which might provide interesting direction for research.
The book is not about neurobiology/pharmacholocybut more about processes at a higher level. In fact this was what I liked most about the book - The ideas it described seemed to tally with the patterns of altered thought I have noticed sometimes myself whilst tripping.
He also describes these patterns using fractal models and I always had a suspicion that they might be involved somewhere.
It is a great read for someone like me with amateur scientific pretentions, because the level of the description is more psychological and uses scientific analogy drawn from stuff I learn't at school, rather than University level stuff.
Enjoy - It's cool that it's online, but you can't beat a realworld copy in my opinion. Plus it might help fund the author to write more.
Respect to James L Kent.
Peace - Pipp