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Published online by Cambridge University Press:  15 June 2012

Eric M. Patterson
Department of Biology, Georgetown University, Washington, DC 20057-1229.
Janet Mann
Department of Biology, Georgetown University, Washington, DC 20057-1229.


Contrary to Vaesen's argument that humans are unique with respect to nine cognitive capacities essential for tool use, we suggest that although such cognitive processes contribute to variation in tool use, it does not follow that these capacities are necessary for tool use, nor that tool use shaped cognition per se, given the available data in cognitive neuroscience and behavioral biology.

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