ABSTRACT
There is a difference between hearing Clyde play the piano and seeing him play the piano. The difference consists in a difference in the kind of experience caused by Clyde’s piano playing. Clyde’s performance can also cause a belief-the belief that he is playing the piano. A perceptual belief that he is playing the piano must be distinguished from a perceptual experience of this same event. A person (or an ani mal, for that matter) can hear or see a piano being played without knowing, believ ing, or judging that a piano is being played. Conversely, a person (I do not know about animals) can come to believe that Clyde is playing the piano without seeing or hearing him do it-without experiencing the performance for themselves.
