Journal of Ethology

, Volume 7, Issue 2, pp 153–166 | Cite as

Neonates' vocal and facial expressions and their changes during experimental playbacks of intra-uterine sounds

  • Atsuya Yoshida
  • Yoshihide Chiba


The present study was conducted to describe neonates' vocalizations and facial expressions in crying states, and to examine the effects of intra-uterine sounds on neonates' vocal and facial behaviors. Based on 22 h taped data taken from 4 healthy full-term neonates ranging in ages of 10–168 h, a total of 1020 samples of vocalization and their accompanying facial expressions were analyzed, and 12 categories of vocalizations and 8 categories of facial expressions were classified. In the playback experiments, it was shown that presentation of intra-uterine sounds changed the fundamental frequencies of infant cry vocalizations. Furthermore, it was found that the intra-uterine sounds elicited a progenitor of the facial expression of “affection” which mainly occurred accompanying the emission of short and low vocalizations.


Facial Expression Fundamental Frequency Animal Ecology Experimental Playback Facial Behavior 
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Copyright information

© Japan Ethological Society 1989

Authors and Affiliations

  • Atsuya Yoshida
    • 1
  • Yoshihide Chiba
    • 2
  1. 1.Department of Psychology, Faculty of Human SciencesOsaka UniversityOsakaJapan
  2. 2.Department of PerinatologyNational Cardiovascular CenterOsakaJapan

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