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I have to say that after our classes this week, I'm feeling stupid now, which is a good thing in learning science. There are just too many questions for what we have discussed. For example, although there is a pattern stored in the central pattern generator, how do we adjust it to suit different conditions? It seems to have something to do with the reafferent loops, but how do the two processes interact? Also, what kind of role does cerebrum play in the adjustments? Why do some patterns, such as riding a bike or drawing pictures, can be created even when we are fairly old, but patterns such as playing an instrument can't?  Is that because playing instrument is more complex, or because there are also limitations in other parts of our bodies (for example, our fingers)?