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The Hand, the Brain and Man’s Travel in Time

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The Hand and the Brain
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Abstract

The interplay between the hand and the brain in the evolution of man is a fascinating subject. Current knowledge, previously based only on fossil discoveries, has recently been substantially increased, thanks to advances in DNA technology. About 4.4 million years ago, hominins, about 120 m in height, had well-developed hands with opposable thumbs, but only rudimentary brains (Ardipithecus ramidus). Many parallel hominin lineages probably evolved and disappeared through the evolutionary process, with the survivors showing a dramatic increase in brain size over the subsequent millions of years. It is believed that bipedalism, together with well-developed hands and the emerging capacity for tool making, were important factors in this process along with such other factors as dietary shifts towards meat and marine food and an evolving capacity to use open fire to process and cook food. Our own species, Homo sapiens, probably emerged in Africa about 200,000 years ago and emigrated out of the continent about 50,000–60,000 years ago, although these time estimates might have to be shifted back in time due to ongoing re-evaluations of the mutation rate in the ‘genetic watch’. Our early ancestors (Homo erectus) probably left Africa millions of years ago, migrating to Europe and Asia, evolving into Neanderthals in Europe.

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Lundborg, G. (2014). The Hand, the Brain and Man’s Travel in Time. In: The Hand and the Brain. Springer, London. https://doi.org/10.1007/978-1-4471-5334-4_2

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