People without conscious brain activity do not know they are smiling..
And you know Terri was without conscious brain activity because...
1. You're a smart-ass
2. You read the papers and watch the news
3. You have a feeding tube yourself
4. Your spouse would never do that to you
5. Your name is Michael...
6. And what is that on your shoes????
See?
I spent Christmas yesterday with a friend who was in a similiar state last year after OD-ing and spending close to 12 hours with interrupted oxygen flow to his brain. For several months he was on a feeding tube with no brain activity. Today he is still-brain damaged and paralyzed, but he is conscious and can speak. He can remember and describe events that too place when he was supposedly in a vegetative state. Medical scientific measures of consciousness are the product of guesswork, not verifiable fact.