The theory does not forbid a node from having no causal effect on anything else, which is what I think an epiphenomenal consciousness would be. But such a node could not be measured. A logical positivist would say this makes the theory meaningless, and I’m inclined to agree.
Conceivably, if the universe runs on a computer, there could be a node which cannot be measured from inside the universe but could be measured from outside. Perhaps debug info is turned on, and any time neurons fire in patterns that match some regex, the word “consciousness” is printed to stderr. I would not say this is meaningless; if it is true, it gives us a way of communicating with whoever is watching stderr (but no guarantee that such a being exists or would talk back).
But it is not suitable as a theory of consciousness, unless you want to stipulate that neurons write about consciousness for reasons that are completely uncorrelated to consciousness.
(Written without reading other comments.)
The theory does not forbid a node from having no causal effect on anything else, which is what I think an epiphenomenal consciousness would be. But such a node could not be measured. A logical positivist would say this makes the theory meaningless, and I’m inclined to agree.
Conceivably, if the universe runs on a computer, there could be a node which cannot be measured from inside the universe but could be measured from outside. Perhaps debug info is turned on, and any time neurons fire in patterns that match some regex, the word “consciousness” is printed to stderr. I would not say this is meaningless; if it is true, it gives us a way of communicating with whoever is watching stderr (but no guarantee that such a being exists or would talk back).
But it is not suitable as a theory of consciousness, unless you want to stipulate that neurons write about consciousness for reasons that are completely uncorrelated to consciousness.