The short answer is that we don't know. When we came home from vacation, my cat wouldn't let me out of his sight if he could avoid it, but we don't know if that's because he knows that I pay attention to him or because he actually missed me on an emotional level.
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Gillian
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"