Single-Neuron Arithmetic

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Science  06 Sep 2002:
Vol. 297, Issue 5587, pp. 1652-1653
DOI: 10.1126/science.1076392

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Can monkeys count? Debates about the numerical abilities of animals have raged among neuroscientists for decades. In a Perspective, Dehaene discusses exciting new work (Nieder et al.) showing that neurons in the lateral prefrontal cortex of the macaque brain encode numbers up to the number five.