only because of a preference to evolve intelligent capabilities instead of reverse engineering a design from written language, modern computer systems and logic
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I wonder if you can consider something like chemotaxis as a kind of symbol manipulation. Ligand -> coherence No ligand -> decoherence. The binding of the thing to the domain is not the thing the bacteria uses for nutrients. It just directs the organism to things like it.
there's no operations over variables, which is what i identified in The Algebraic Mind chapter 2 as core to symbol-manipulation hypothesis. (almost anything could be described as a symbol, depending on your preferred definition of that term.)
