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Homo sapiens may be as much socialus as sapiens. See what I mean in my article, “The It Factor,” in the September Scientific American, which describes how chimpanzees and children just a bit beyond their second birthdays have about the same level of certain types of cognition—the kind of quantitative and spatial reasoning abilities that typically appear on IQ tests.
The psychologist/primatologist who spearheaded this research is Michael Tomasello of the Max Planck Institute for Evolutionary Anthropology. Watch Tomasello describe his work during a video interview made in conjunction with his reception of the Dr A. H. Heineken Prize for Cognitive Science 2010.