 Perceptual learning involves changes in  perception.[2]  This rules out mere changes in aesthetic taste, among other things. For instance, imagine a contrarian who likes things only insofar as other people do not like those things. Suppose he finds out that everyone else has come to like his favorite microbrew. This might cause him to change how he judges that beer aesthetically. However, the beer may well taste the same to him. So, it is not a case of perceptual learning, but a mere change in the person’s aesthetic judgment. The fact that perceptual learning involves changes in perception also rules out mere changes in belief. Suppose someone acquires the belief that the symphony movement they are hearing is a scherzo. If nothing changes in that person’s perception, this is not a case of perceptual learning. It is a change in the person’s belief, not a change in the person’s perception.