Origins of smile and laughter: a preliminary study.

نویسندگان

  • Kiyobumi Kawakami
  • Kiyoko Takai-Kawakami
  • Masaki Tomonaga
  • Juri Suzuki
  • Tomiyo Kusaka
  • Takashi Okai
چکیده

To present fundamental data, spontaneous smiles and spontaneous laughs (smiles accompanied by vocal sounds) were cross-sectionally observed in 10 newborn infants and longitudinally observed in six infants. Unilateral spontaneous smiles were more common than bilateral smiles in neonates, but by 2 months almost all spontaneous smiles were bilateral. All spontaneous laughs were bilateral. "Spontaneous smile" and "Spontaneous laugh" might be different behaviors from the beginning.

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عنوان ژورنال:
  • Early human development

دوره 82 1  شماره 

صفحات  -

تاریخ انتشار 2006