The problem with this statement is that PVS is a subjective diagnosis, there are no tests for it. That means PVS is whatever the examining Dr thinks it is. PVS diagnosed patients range from comatose to people able to interact at different levels. The fact that we are using a subjective diagnosis to decide literal life and death matters is what always bothered me the worst about the Terri issues. I read quite a bit about what PVS is and isn't and the truth is there is no way to know for sure.
Bingo.