Symmetry for the sake of symmetry, or symmetry for the sake of behavior?

Behavioral and Brain Sciences 25 (3):423-424 (2002)
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Abstract

Wynn suggests that the imposition of symmetry on stone tools is indicative of the evolutionary development of cognitive abilities of the tool makers, particularly that of creating mental images. I suggest that it is more likely indicative of the evolutionary development of the perceptual ability to detect resources for behavior of hand-held objects.

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