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Animal Cognition

, Volume 21, Issue 5, pp 715–728 | Cite as

Human ostensive signals do not enhance gaze following in chimpanzees, but do enhance object-oriented attention

  • Fumihiro Kano
  • Richard Moore
  • Christopher Krupenye
  • Satoshi Hirata
  • Masaki Tomonaga
  • Josep Call
Original Paper

Abstract

The previous studies have shown that human infants and domestic dogs follow the gaze of a human agent only when the agent has addressed them ostensively—e.g., by making eye contact, or calling their name. This evidence is interpreted as showing that they expect ostensive signals to precede referential information. The present study tested chimpanzees, one of the closest relatives to humans, in a series of eye-tracking experiments using an experimental design adapted from these previous studies. In the ostension conditions, a human actor made eye contact, called the participant’s name, and then looked at one of two objects. In the control conditions, a salient cue, which differed in each experiment (a colorful object, the actor’s nodding, or an eating action), attracted participants’ attention to the actor’s face, and then the actor looked at the object. Overall, chimpanzees followed the actor’s gaze to the cued object in both ostension and control conditions, and the ostensive signals did not enhance gaze following more than the control attention-getters. However, the ostensive signals enhanced subsequent attention to both target and distractor objects (but not to the actor’s face) more strongly than the control attention-getters—especially in the chimpanzees who had a close relationship with human caregivers. We interpret this as showing that chimpanzees have a simple form of communicative expectations on the basis of ostensive signals, but unlike human infants and dogs, they do not subsequently use the experimenter’s gaze to infer the intended referent. These results may reflect a limitation of non-domesticated species for interpreting humans’ ostensive signals in inter-species communication.

Keywords

Domestication Gaze following Great ape Ostensive signals Referential communication 

Notes

Acknowledgements

We thank Naruki Morimura, Yutaro Sato, Ruiting Song and the staff at Kumamoto Sanctuary, Primate Research Institute, Kyoto University Institute for Advanced Study, and Wolfgang Kohler Primate Research Center for their assistance in conducting the series of experiments. We also thank two anonymous reviewers for their helpful comments. Financial support came from Ministry of Education, Culture, Sports, Science and Technology [K-CONNEX to FK], Japan Society for Promotion of Science KAKENHI 26885040, 16K21108, and 18H05072 to FK, 26245069, 16H06301, 16H06283, and 18H05524 to SH, 15H05709, 16H06238, and JSPS-CCSN to MT, and JSPS-LGP-U04 and Great Ape Information Network to SH and MT, and the European Research Council [SOMICS 609819 to JC].

Supplementary material

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Supplementary material 1 (XLSX 22 KB)
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Supplementary material 4 (XLSX 21 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Kumamoto SanctuaryKyoto UniversityKumamotoJapan
  2. 2.Berlin School of Mind and BrainHumboldt-Universität zu BerlinBerlinGermany
  3. 3.Department of Developmental and Comparative PsychologyMax Planck Institute for Evolutionary AnthropologyLeipzigGermany
  4. 4.School of Psychology and NeuroscienceUniversity of St. AndrewsSt. AndrewsUK
  5. 5.Primate Research InstituteKyoto UniversityInuyamaJapan

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