So, suppose science and computing technology someday advance to the point that they can make a print out of exactly what thoughts are going to run through your head at what times. (yeah, I know that's ridiculous, but it seems at least logically conceivable, though definitely not possible in our universe) Ok, so they print out all your thoughts and then give it to you to read. So you're reading the thoughts that you're thinking as you read. So the predictions they made, which are really mental states, have been encoded in words and are now being decoded into perceptual information. It's like when you point a camera at the TV it's hooked to, and you get a crazy spiral feedback loop. In this case your mental states would loop around and become input to the computations that calculate the mental states from perceptual input. HOOOOLY SHIIT!