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Assessment of Social Cognition in Non-human Primates Using a Network of Computerized Automated Learning Device (ALDM) Test Systems

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Neocortex size and behavioural ecology in primates

¹Department of Anthropology, University of Durham.

Proceedings. Biological Sciences

|February 22, 1996

Summary

This summary is machine-generated.

Neocortex size in primates is linked to social group size, particularly in haplorhines. This brain evolution also correlates with diurnal activity and frugivory, reflecting cognitive demands.

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Area of Science:

Primate Paleoneurology
Comparative Neuroanatomy
Evolutionary Biology

Background:

The neocortex is central to mammalian brain evolution, yet factors driving its diverse size and structure remain debated.
Previous research suggests a link between neocortical evolution and social complexity in primates.

Purpose of the Study:

To investigate the selective pressures driving neocortical evolution in primates.
To determine the relationship between neocortex size, social group size, and ecological factors.

Main Methods:

Comparative analysis of neocortex size and social group size across primate taxa.
Statistical controls for phylogenetic history and overall brain size.
Examination of ecological correlates, including activity patterns (diurnal/nocturnal) and diet (frugivory).

Main Results:

A significant positive correlation was found between neocortex size and social group size in primates, specifically within haplorhine primates.
Neocortex size was larger in diurnal primates compared to nocturnal ones.
Among diurnal haplorhines, neocortex size positively correlated with the degree of frugivory.

Conclusions:

Sociality is a key driver of neocortical evolution in haplorhine primates.
Ecological factors, such as diurnal activity and diet, also influence neocortex size, reflecting its diverse sensory and cognitive functions.