To hear a C you need time and a lot of memory

[Added November 1997]
The processing of sounds by the brain consists in taking a temporal sequence
of single values coming from the ear and trying to give to these some meaning
(for now forget that we have two ears to make things simple).
But only to hear a single note your brain must sample the sound for some time
and has to store the information somewhere.A lot more you have to store just
to follow a tune. This storage is called working memory and should
be present also for the eye.