Three hands for the Neandertals

paleoneurology

Lozano et al 2008Together with Marina Lozano (IPHES), this week we have published a JASs Forum on a speculative hypothesis concerning the use of the mouth in support to praxis and handling in Neandertals and their ancestors, as evidenced through the analysis of their dental marks. This behaviour, very common in Homo neanderthalensis and Homo heidelbergensis, is not so frequent in modern hunter-gatherer. According to the theory of extended mind, cognition is the result of the interaction between brain and environment as mediated by the experience of the body. The main “ports” of such interface are the eye (input, from the world to the brain) and the hand (output, from the brain to the world). Modern human brain displays a peculiar dilation of the deep parietal areas, which are particularly involved in visuo-spatial integration, which includes the management of the eye-hand system, the integration with memory, and the…

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