Language Evolution, Symbolic Cognition, Language Acquisition, Brain Development, Origin of the Human Mind | Terrence Deacon | 20
Mind & Matter
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Evolution of Brain Sizes and Stone Tools
Over the course of the next million and a half years, brain sizes expanded, with brain sizes like ours only appearing a few hundred thousand years ago. The first stone tools, chipped stones, began to show up in the fossil record about 2.5 million years ago, and by 1.8 million years ago, they never appeared separate from hominids. This stabilization coincided with the simultaneous appearance of stone tools and slightly enlarged brains. Stone tools were likely used for butchery and cutting up meat from other animals.
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