Perception of the average size of multiple objects in chimpanzees (Pan troglodytes).

ABSTRACT: Humans can extract statistical information, such as the average size of a group of objects or the general emotion of faces in a crowd without paying attention to any individual object or face. To determine whether summary perception is unique to humans, we investigated the evolutional origins of this ability by assessing whether chimpanzees, which are closely related to humans, can also determine the average size of multiple visual objects. Five chimpanzees and 18 humans were able to choose the array in which the average size was larger, when presented with a pair of arrays, each containing 12 circles of different or the same sizes. Furthermore, both species were more accurate in judging the average size of arrays consisting of 12 circles of different or the same sizes than they were in ju

SUBMITTER: Imura T 

PROVIDER: S-EPMC5577472 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature