從ask-why版看到的
http://faculty.washington.edu/chudler/tenper.html
其實這不是重點
重點是想請高手解釋一下這段
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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