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The no. of neurons only increase during development. As, a person grows, the no. of neurons is constant or decreases (degradation due to injury or other brain diseases). The no. never increases. Learning anything (say, a phone no.) requires repeated thinking. The thinking can be continuous in the brain or re-induced by revision. Therefore, learning ...


According to Comparative Vertebrate Neuroanatomy, the XYW classfication is used for cat retina. They roughly correspond to the M, P, K cells in primates, respectively.

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