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The_Duck comments on The Fabric of Real Things - Less Wrong
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Koan 2:
"Does your rule there forbid epiphenomenalist theories of consciousness - that consciousness is caused by neurons, but doesn't affect those neurons in turn? The classic argument for epiphenomenal consciousness has always been that we can imagine a universe in which all the atoms are in the same place and people behave exactly the same way, but there's nobody home - no awareness, no consciousness, inside the brain. The usual effect of the brain generating consciousness is missing, but consciousness doesn't cause anything else in turn - it's just a passive awareness - and so from the outside the universe looks the same. Now, I'm not so much interested in whether you think epiphenomenal theories of consciousness are true or false - rather, I want to know if you think they're impossible or meaningless a priori based on your rules."
How would you reply?
As I read it, the rule does not forbid epiphenomena. Epiphenomena are caused by ordinary things that we can observe, so they are connected to us by causal links, even though we can never discover these links, since epiphenomena do not themselves cause anything we can observe.
This seems like a coherent way the universe could be, but isn't. The machine simulating the universe could constantly scan it for blue objects and populate a list of all blue objects--but without using that list for anything further. This would be an epiphenomal blue-ness tag.