| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 3917988 | Early Human Development | 2006 | 6 Pages |
Abstract
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.
Keywords
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Authors
Kiyobumi Kawakami, Kiyoko Takai-Kawakami, Masaki Tomonaga, Juri Suzuki, Tomiyo Kusaka, Takashi Okai,