Non-mental aspects of encephalisation: The forebrain as a playground of mammalian evolution
Tóm tắt
Neo-darwinian theory holds that changes in mammalian and avian body morphology follow behavioral adaptation. The problem then is to explain how random mutations can result in a sufficiently rapid reorganization of the most complex biological system —common sense would predict that the CNS is the slowest to evolve. This paper attempts a parsimonious explanation which predicts that the accumulation of genetic variation is most likely in CNS systems ranking high in the functional hierarchy of the brain, and that thetop-ranking systems are the preferred initial targets after increased selective pressure. They thus serve as a matrix for subsequent canalized selection which leads to a comparatively rapid, top-to-bottom reorganization of the CNS, providing a neuronal framework for the evolution of body morphology.
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