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Title: Perception of the average size of multiple objects in chimpanzees (Pan troglodytes)
Authors: Imura, Tomoko
Kawakami, Fumito
Shirai, Nobu
Tomonaga, Masaki  kyouindb  KAKEN_id
Author's alias: 伊村, 知子
川上, 文人
白井, 述
友永, 雅己
Keywords: perception
summary statistics
ensemble coding
Issue Date: 30-Aug-2017
Publisher: The Royal Society
Journal title: Proceedings of the Royal Society B: Biological Sciences
Volume: 284
Issue: 1861
Thesis number: 20170564
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 judging the average size of arrays consisting of a single circle. Our findings could not be explained by the use of a strategy in which the chimpanzee detected the largest or smallest circle among those in the array. Our study provides the first evidence that chimpanzees can perceive the average size of multiple visual objects. This indicates that the ability to compute the statistical properties of a complex visual scene is not unique to humans, but is shared between both species.
Description: チンパンジーも複数の物体の大きさの「平均」を知覚 . 京都大学プレスリリース. 2017-08-24.
Rights: © 2017 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.
DOI(Published Version): 10.1098/rspb.2017.0564
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