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along with an increase in body size, led to an increase in brain size. Human brain size evolved most rapidly during a time of dramatic climate change. When smaller points were eventually made, they could be attached to smaller, sleeker shafts to make darts, arrows, and other projectile weapons. Speed of Growth, chimpanzee brains grow rapidly before birth. Average weight of modern human brain: 1,352 g (2.98 lb). In Africa, the Middle Stone Age toolkits sometimes include blades and other types of archeological evidence (beads and artifacts that indicate the use of color and symbols) that are typical of the Upper Paleolithic in Europe. The modern human brain is the largest and most complex of any living primate. As early humans faced new environmental challenges and evolved bigger bodies, they evolved larger and more complex brains. Why the sudden increase in brain size?

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Graphs showing changes in climate and changes in braincase volume. To obtain an accurate measure of brain size, scientists remove an endocast from the braincase and record its volume, or use CT scanning to measure the inside of the braincase. Brain size increases slowly, from 62 million years ago, during this time period, early humans began to walk upright and make simple thursday hookup rover tools. Evidence of ancient brains, endocasts are replicas of the insides of early and modern human braincases. Explore some examples of Middle Stone Age tools. Benefits and Costs of a Big Brain. As the environment became more unpredictable, bigger brains helped our ancestors survive. Here, the term Middle Stone Age includes a variety of toolkits from Africa and also the toolkits usually referred to as the Middle Paleolithic in Europe.

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