从ask-why版看到的 http://faculty.washington.edu/chudler/tenper.html 其实这不是重点 重点是想请高手解释一下这段 Furthermore, from an evolutionary point of view, it is unlikely that larger brains would have developed if there was not an advantage. Certainly there are several pathways that serve similar functions. For example, there are several central pathways that are used for vision. This concept is called "redundancy" and is found throughout the nervous system. Multiple pathways for the same function may be a type of safety mechanism should one of the pathways fail. --

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