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Although we really know very little about the living world, our ignorance is nowhere more profound than when it comes to the nervous system. How is visual perception created? What is a memory? How do brain cells come to organize themselves correctly during development? We cannot answer any of these questions adequately, and since our knowledge of the nervous system is so inadequate, the theories we develop are very tentative. The fact that theories in this field are constantly being toppled asdoi:10.2307/4448066 fatcat:mgkdxa5kb5fpvmocjp2vb5nmqu