Dave - have you NEVER seen any of the videos of Terri??? Have you seen the one with her father making her laugh regarding her lazy eye? UNCONSCIOUS??? I HARDLY think so!
Come on. Get real. They filmed four or more hours. During most of that time they got no response. A few times they got lucky and they filmed what looks like a response to something that they did but it was a random action. so the video you see is at most a few minutes. Where is the other four hours?
There is also a lot of acting where the parents seem to move to where Terri's eyes are moving to make it look like Terri is tracking them. There is a saying that you can put 25 monkeys in a room with typewriters and if they had an infinite amount of time they could create the entire works of Shakesphere.
Even the doc from the Mayo Clinic that Jeb Bush was so hot on said that in the time he was with Terri he couldnt find any action that was anything but random. Same thing with Terri's Guardian Ad Litem and most of the doctors who actually examined her, except for those being paid by the Schindlers as expert witnesses.