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Fission-fusion dynamics, behavioral flexibility, and inhibitory control in primates
Federica Amici1, Filippo Aureli, Josep Call
1Research Centre in Evolutionary Anthropology and Palaeoecology, School of Biological and Earth Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool L3 3AF, United Kingdom.
Current Biology : CB
|September 23, 2008
Summary
Complex social living, particularly fission-fusion (FF) dynamics, enhances primate cognitive skills like inhibition. Species with higher FF dynamics showed better inhibitory control, supporting the social brain hypothesis over other factors.
Area of Science:
- Primate cognitive evolution
- Socioecology
- Behavioral neuroscience
Background:
- The Social Brain Hypothesis posits that large brains evolved due to complex social structures.
- Fission-fusion (FF) social dynamics, characterized by shifting subgroups, are a key aspect of social complexity.
- Cognitive skills like inhibition are crucial for navigating dynamic social environments.
Purpose of the Study:
- To investigate the relationship between fission-fusion (FF) dynamics and inhibitory control in primates.
- To compare cognitive performance across primate species with varying social structures and ecological factors.
- To test socioecological, phylogenetic, and ecological explanations for cognitive differences.
Main Methods:
- Compared the performance of seven primate species (chimpanzees, bonobos, orangutans, spider monkeys, gorillas, capuchin monkeys, long-tailed macaques) on five inhibition tasks.
- Grouped species based on high vs. low levels of fission-fusion (FF) dynamics.
- Analyzed data considering diet, phylogenetic relatedness, and FF dynamics to differentiate explanatory factors.
Main Results:
- Primate species exhibiting high fission-fusion (FF) dynamics consistently outperformed those in cohesive groups on inhibition tasks.
- Spider monkeys performed comparably to chimpanzees, bonobos, and orangutans, and superior to gorillas.
- A cluster analysis revealed a strong grouping of species with high FF dynamics, irrespective of phylogeny or diet.
Conclusions:
- Enhanced inhibitory skills in primates are significantly associated with the degree of fission-fusion (FF) social dynamics.
- The findings support the role of socioecological factors, specifically FF dynamics, in driving cognitive evolution.
- Phylogenetic relatedness and feeding ecology appear to be less influential than FF dynamics on inhibitory abilities.
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