Juno_Watt comments on How sure are you that brain emulations would be conscious? - Less Wrong
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Why would that be possible? Neurons have to process biochemicals. A full replacement would have to as well. How could it do that without being at least partly biological?
It might be the case that an adequate replacement -- not a full replacment -- could be non-biological. But it might not.
It's a thought experiment. It's not meant to be a practical path to artificial consciousness or even brain emulation. It's a conceptually possible scenario that raises interesting questions.
I am saying it is not conceptually possible to have something that precisely mimics a biological entity without being biological.
It will need to have a biological interface, but its insides could be nonbiological.