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Thanks for the suggestion, ordered it ;)

Related video by the author that was also interesting: https://www.ted.com/talks/jeff_hawkins_on_how_brain_science_...

Jeff Hawkins dismisses the metaphysical in his theories. Is this true of the neuroscience world in general?

Well depending on what is defined as "metaphysical" there is scant if any evidence. Scientists tend to dismiss things when there is no supporting evidence.

Has anyone managed to do anything serious with HTMs yet? They talk them up something massive but no-one seems to use them for anything.