The developing and mature nervous system must solve two major problems. The brain must be able to function properly, or at least well, and it must be able to change. We will see that these two problems are aspects of the same task. I am reminded of a 1931 painting by Salvador Dali called "The Persistence of Memory." In the painting, the faces of clocks had become rather fluid, and they hung loosely and folded over tree branches. The plastic clocks reminded me that we do retain our memories over long periods of time, but the memories change and gradually become distorted. While we clearly do have brain mechanisms for storing information, or

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