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Pigtail Macaque (Macaca nemestrina) Performance Differs Across Multiple Cognitive Domains in Comparison to Rhesus
Isabella M Baumann1, Bess Carlson2, Jasmine Hadeed2
1Department of Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
American Journal of Primatology
|April 18, 2025
Summary
Pigtail macaques show distinct cognitive differences compared to rhesus macaques, particularly in short-term memory and complex quantity discrimination tasks. These findings highlight the need for independent assessment of pigtail macaque cognition.
Area of Science:
- Primate Cognition
- Comparative Psychology
- Neuroscience
Background:
- Rhesus and pigtail macaques, though closely related with similar social structures, exhibit observed behavioral and personality differences.
- Previous research has often used rhesus macaque findings as a proxy for pigtail macaque cognition, a practice that may be inaccurate.
- Systematic documentation of pigtail macaque cognitive abilities is lacking.
Purpose of the Study:
- To independently assess and understand the cognitive abilities of pigtail macaques.
- To identify specific cognitive differences between pigtail macaques and rhesus macaques.
- To validate cognitive tasks for interspecies comparison in non-human primates.
Main Methods:
- A battery of three cognitive tasks was administered to both pigtail macaques and rhesus macaques.
- Tasks included a three cups task (short-term memory), a reversal learning task (rule learning and flexibility), and a quantity discrimination task (numerosity).
- Rhesus macaques served as a control group to validate methods and enable direct comparison.
Main Results:
- Significant species differences were observed across the three tasks.
- In short-term memory (15s delay), rhesus macaques performed above chance, while pigtail macaques did not.
- Pigtail macaques demonstrated superior accuracy in hard-ratio trials of the quantity discrimination task compared to rhesus macaques.
Conclusions:
- Pigtail macaques possess distinct cognitive profiles compared to rhesus macaques, necessitating independent research.
- Cognitive flexibility and numerical cognition show species-specific variations.
- This study enhances the understanding of pigtail macaque cognition and improves rigor in translational research.
