Primate Biology
Primate Biology
Primate Biology
Articles | Volume 11, issue 2
Articles | Volume 11, issue 2
https://doi.org/10.5194/pb-11-19-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/pb-11-19-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 11, issue 2
Research article
 | 
26 Jul 2024
Research article |  | 26 Jul 2024

The effect of reward value on the performance of long-tailed macaques (Macaca fascicularis) in a delay-of-gratification exchange task

Judit J. Stolla and Stefanie Keupp

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Short summary
In the context of the ManyPrimates initiative, our long-tailed macaques (Macaca fascicularis) rarely exchanged a given food item for a larger food reward at a later time. We tested whether possession of a high-value food item affected their performance and found that macaques displayed improved abilities when the value of the exchange item is reduced. This suggests that the possession of a high-value item contributed to the low performance of the monkeys in the original exchange protocol.
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