gets a reward, a small amount of water. if he breaks the beam and it’s the other sound that is presented he goes to the other port and gets his reward. and as you can see the rat really understands what he is supposed to do. he sticks his nose in, goes in one way, sticks his nose in, goes the other way. he is going as fast as he can to pick up his rewards. now what you actually hear on this video is that the low frequency and high frequency sounds are both masked by some white noise. that is to make it more challenging for the rat 