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If you are truly interested in the topics of this book, there are many more modern adaptations of the idea that have taken this research further.
It was a great book, and I believe the author was ahead of the curve at the time, but when he is talking about technology, we are leaps and bounds ahead of where he mentions in the book.
Although it is somewhat comforting to validate the information.
Periodically the audio book will skip over a sentence in the book. It also skipped four pages (109-113 depending on your book copy)