A complete theory of human evolution of intelligence must consider stage changes

Behavioral and Brain Sciences 25 (3):404-405 (2002)
We show 13 stages of the development of tool-use and tool making during different eras in the evolution of Homo sapiens. We used the NeoPiagetian Model of Hierarchical Complexity rather than Piaget's. We distinguished the use of existing methods imitated or learned from others, from doing such a task on one's own.
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DOI 10.1017/S0140525X02240078
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