Causal beliefs lead to toolmaking, which require handedness for motor control

Behavioral and Brain Sciences 26 (2):242-242 (2003)

Abstract
Toolmaking requires motor skills that in turn require handedness, so that there is no competition between the two sides of the brain. Thus, handedness is not necessarily linked to vocalization but to the origin of causal beliefs required for making complex tools. Language may have evolved from these processes.
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DOI 10.1017/S0140525X03580062
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The Language Instinct.Steven Pinker - 1994/2007 - Harper Perennial.
Perceptual Symbol Systems.Lawrence W. Barsalou - 1999 - Behavioral and Brain Sciences 22 (4):577-660.
Natural Language and Natural Selection.Steven Pinker & Paul Bloom - 1990 - Behavioral and Brain Sciences 13 (4):707-27.
Primate Cognition.Amanda Seed & Michael Tomasello - 2010 - Topics in Cognitive Science 2 (3):407-419.

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