First of all, Every bit of evidence there is suggests that consciousness could not exist without the brain. On the other hand, there is ZERO evidence that it could.
There's absolutely no evidence that conscience couldn't exist without a brain, unless perhaps theoretically, which here is a very weak evidence at most. Empirically, to demonstrate it, you had to know what's consciousness in the first instance and then know how to detect and record it's existence. Thus, you could prove that there's no consciousness remaining after removing or destroying a brain or that part or all of consciousness remained after that. There's no such experiment in the whole history of humanity (at least recorded).
There's only evidence that by losing parts of the brain by disease or accident you lose mental functions, and this
As I told before, I'm preparing a mental experiment, something like the Chinese box by Searle, to demonstrate it.
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