Journal
NATURE
Volume 447, Issue 7148, Pages 1075-U2Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nature05852
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- NCRR NIH HHS [P51 RR000166] Funding Source: Medline
- NEI NIH HHS [R01 EY011378] Funding Source: Medline
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Our brains allow us to reason about alternatives and to make choices that are likely to pay off. Often there is no one correct answer, but instead one that is favoured simply because it is more likely to lead to reward. A variety of probabilistic classification tasks probe the covert strategies that humans use to decide among alternatives based on evidence that bears only probabilistically on outcome. Here we show that rhesus monkeys can also achieve such reasoning. We have trained two monkeys to choose between a pair of coloured targets after viewing four shapes, shown sequentially, that governed the probability that one of the targets would furnish reward. Monkeys learned to combine probabilistic information from the shape combinations. Moreover, neurons in the parietal cortex reveal the addition and subtraction of probabilistic quantities that underlie decision-making on this task.
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