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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
Article

Abstract

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.

Keywords

Facial Expression Fundamental Frequency Animal Ecology Experimental Playback Facial Behavior 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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