Chemical processes are not measurably discrete, so it is only a conjecture that the universe could be modeled as a finite automaton. Varying reference frames m

Chemical processes are not measurably discrete, so it is only a conjecture that the universe could be modeled as a finite automaton. Varying reference frames make it impossible to agree on an order for the input our brains receive, even if we can think of it as discrete. Agreeing on the state of a brain is also impossible, due to relativity. Quantum entanglement makes it impossible to accurately model a portion of the physical universe, such as a brain. If you want complete accuracy you must model the whole universe or none of it. I am aware of no accepted model of the universe that is deterministic. Finite automata are deterministic, the brain and the universe are not. Look up "hidden variables". Only a more sophisticated model than finite automata could possibly be useful for describing physical phenomena in general. All models are wrong, but finite automata are not even useful for describing brains.