Brain Evolution: New Light on Old Principles

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Science  11 Dec 1970:
Vol. 170, Issue 3963, pp. 1224-1225
DOI: 10.1126/science.170.3963.1224


The fossil evidence on the evolution of brains and bodies in mammals shows that there has been a progressive increase in relative brain size accompanied by and correlated with increased diversity among species in relative brain size. Small-brained species have also evolved, but more large-brained species have appeared in successive epochs.