Is Language the Key to Human Intelligence?

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Science  16 Jan 2004:
Vol. 303, Issue 5656, pp. 318-320
DOI: 10.1126/science.1093993

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What factors make humans unique? Spoken language? Recursion? In his Perspective, Premack uses a recent study showing that tamarin monkeys can acquire nonrecursive but not recursive grammar ( Fitch et al.) as a springboard to discuss various aspects of human uniqueness.