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The first smile: spontaneous smiles in newborn Japanese macaques (Macaca fuscata)

Abstract

Spontaneous smiles are facial movements that are characterized by lip corner raises that occur during irregular sleep or drowsiness without known external or internal causes. They are shown by human infants and infant chimpanzees. These smiles are considered to be the developmental origin of smiling and laughter. There are some case studies showing that spontaneous smiles occur in Japanese macaques. The goals of this study were to investigate whether newborn Japanese macaques show a considerable number of spontaneous smiles thus to examine the mechanism of them. Seven newborn Japanese macaques were observed in a room for an average of 44 min, and incidental sleeping situations were monitored twice. All seven participants showed spontaneous smiles at least once during the observation. They showed 8.29 spontaneous smiles in average (SD = 10.89; 58 smiles in total), all found in the state of REM sleep. Thirty-nine of the 58 smiles were produced on the left side of the mouth. These characteristics were similar to those of spontaneous smiles in human infants. This is the first evidence that macaques as well as hominoids show a considerable number of spontaneous smiles. These phenomena may facilitate the development of the zygomaticus major muscle, which is implicated in smiling-like facial expressions.

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Acknowledgments

Financial support for this research was provided by JSPS KAKENHI Grant No. 11J07455, 13J00208, 16K21128, 11710035, 13610086, 19300091, 20002001, 23220006, 24000001, and 15H05709. This study was supported by the Cooperative Research Program of the Primate Research Institute, Kyoto University (2000-A-9-1, 2003-B-1, 2007-B-1, 2008-B-15, 2009-B-15, and 2010-B-4). We would like to thank Drs. Tetsuro Matsuzawa, Kiyobumi Kawakami, Kiyoko Takai-Kawakami, and Akifumi Tokosumi for their kind support and suggestions. The experimental procedures used in this study were approved by the Animal Welfare and Animal Care Committee of the Primate Research Institute, Kyoto University, and by the Animal Research Committee of Kyoto University. All procedures adhered to the Japanese Act on the Welfare and Management of Animals.

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Correspondence to Fumito Kawakami.

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Kawakami, F., Tomonaga, M. & Suzuki, J. The first smile: spontaneous smiles in newborn Japanese macaques (Macaca fuscata). Primates 58, 93–101 (2017). https://doi.org/10.1007/s10329-016-0558-7

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Keywords

  • Smiles
  • Emotion
  • Neonates
  • Allometric timing constancy