Abstract
Previous studies have shown that elementary aspects of numerical abilities have developed in non-human primates. In the present study, we explored the potential for the development of a novel ability in the use of numerical operations by macaque monkeys (Macaca fuscata): adequate selection of a series of numerical actions toward achieving a behavioral goal. We trained monkeys to use a pair of devices to selectively add or subtract items to/from a digital array in order to match a previously viewed sample array. The monkeys determined whether to add or subtract on the basis of the feedback about numerosity given to the monkeys, which was displayed as an outcome of each step of the numerical operation. We also found that monkeys adapted flexibly to changes in the numerical rule that determined the relationship between device use and numerical operation. Our model analysis found that the numerosity-based model was a better fit for the monkeys’ performance than was the reward-expectation-based model. Such a capacity for goal-oriented selection of numerical operations suggests a mechanism by which monkeys use numerical representations for purposeful behaviors.
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Acknowledgments
This work was supported by Core research for Evolutional Science & Technology (CREST) of Japan Science and Technology Agency (JST) and by Grants-in-Aid for Scientific Research, Ministry of Education, Science, and Culture, Japan (Grant no 22300124). We thank K. Shima, Y. Matsuzaka, K. Sakamoto, T. Nakajima, A. Mita, M. Kurama, and Y. Takahashi, for technical help, and N. Kanazawa for artwork.
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Okuyama, S., Iwata, Ji., Tanji, J. et al. Goal-oriented, flexible use of numerical operations by monkeys. Anim Cogn 16, 509–518 (2013). https://doi.org/10.1007/s10071-012-0592-9
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DOI: https://doi.org/10.1007/s10071-012-0592-9