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Check out the work of Adrian Owen. He showed using brain scanning technology like fMRI and EEG that patients that were thought to be in a persistent vegetative state were aware and could respond to questions. I believe he estimated 5-10% of such patients might be responsive although don't quote me on that.
Here are some resources for the interested:
https://en.wikipedia.org/wiki/Adrian%5C_Owen[1][2]
1: https://en.wikipedia.org/wiki/Adrian%5C_Owen
2: https://en.wikipedia.org/wiki/Adrian_Owen
Owen, A. (2017). Into the gray zone: A neuroscientist explores the border between life and death. Simon and Schuster.
There's nothing here!