Please, look at the last sentence in the passage. What does 'that' refer to? And the last sentence evades me. What does the sentence mean?
But here's the key point: Your brain doesn't know, and it doesn't care, where it gets the data from. Whatever information comes in, it just figures out what to do with it. And this is a very efficient kind of machine. It's essentially a general purpose computing device, and it just takes in everything and figures out what it's going to do with it, and that, I think, frees up Mother Nature to tinker around with different sorts of input channels.