You can train a rat to run pretty complicated mazes. You’re never going to train a rat to run a prime number maze — a maze that says, “turn right at every prime number.” The reason is that the rat just doesn’t have that concept. And there’s no way to give it that concept. It’s out of the conceptual range of the rat. That’s true of every organism. Why shouldn’t it be true of us? I mean, are we some kind of angels? Why shouldn’t we have the same basic nature as other organisms? In fact, it’s very hard to think how we cannot be like them. Take our physical capacities. I mean, take our capacity to run 100 meters. We have that capacity because we cannot fly. The ability to do something entails the lack of ability to do something else. I mean, we have the ability because we are somehow constructed so that we can do it. But that same design that’s enabling us to do one thing is preventing us from doing something else. That’s true of every domain of existence. Why shouldn’t it be true of cognition?