Caledonian2 comments on Zombies! Zombies? - Less Wrong
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If 'consciousness' plays a causal role, then we cannot imagine a world in which it is removed, yet everything behaves precisely as it did when it was present.
In that case, p-zombies are impossible, because the whole point of their hypothesized existence is that they're identical in every way to people with 'consciousness' except that they lack it. If you remove a causal factor from people, they behave differently in some way, even if the difference is not immediately obvious to a limited observer. If the p-zombies really do behave precisely the same as they would with 'consciousness', and nothing else has been changed, then there is no difference between having consciousness and lacking it.