But we merely define specific physical interactions as storage, sensory input, output, etc. If one truly wanted to apply metaphilosophy to this one could say that sensory input is merely one long complex interaction, defined by relatively simple principals. somewhat similar to the conduction of electricity in a metal. Just an interaction of various wavefunctions. Heck one could even go so far as to say that we are all just part of a large continuous interaction between various different manifestations of energy. If one wanted to apply a simplistic analogy to it, one could thing of the game the incredible machine, where a single simple action causes a chain reaction which has a final result, and an initial input which are both relatively simple, but goes through the complex interactions as mentioned above.

Also just because someone wrote a book on it doesn't make it the absolute truth. We must always question our foundations of knowledge.