Was a manual gesturing stage really necessary?

Behavioral and Brain Sciences 26 (2):223-224 (2003)
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Abstract

Given the primate propensity to make noise, it is unclear why a manual gestural stage would have been necessary in the development of either language or right-handedness. Cortical asymmetries are present in australopithecines but become clearly human-like with the appearance of Homo about two million years ago, including Broca's cap regions. Stone tool-making is still our only empirical entry into past cognitive processes.

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