Primates have brains that are
approximately twice as large as those of other similarly-sized
mammals. Furthermore, also within the primate order brains have not
only become increasingly large, but have also revealed a
significant increase in cortical mass. The social brain hypothesis
posits that this increase is due to the demands of life in a
complex social group, and data regarding the relationship between
brain size and social complexity support this view. Whether this
pressure only affects
Keywords: Comparative Cognition; Old World monkeys; Social Cognition; Physical Cognition; Primates; Baboon; Macaque; Primate Cognition Test Battery; Quantity Discrimination; Size Discrimination; Communication
