The author is in the Department of Neurobiology, Duke University Medical Center, Durham, North Carolina 27710, USA. platt@neuro.duke.edu
In many competitive games, players need to behave unpredictably so that their opponents cannot anticipate the next move. New recordings from monkeys playing a computer game support the idea that neurons in the prefrontal cortex may control this behavior and imply there is a cost for generating random behavior, which monkeys avoid unless the opponent is sophisticated.
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