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The key problem with the "brain in a vat" thought experiment
(bigthink.com)
Social Experiment. Become Me. What I see, you see.
I think the argument comes down to this:
-- That the brain requires something wrapped around it responding to it and pumping the right juices to and fro.
Which is fine and makes total sense. From there however, the rest of the argument seems to veer completely philosophical - ie. Whether such a "body" changes the definition of what it means to "just" be a brain in a vat. It seems somewhat semantic to me, but I guess they want to make the point that consciousness is not just electrical signals.