A Cohort Study Examining Genetic and Environmental Factors on Infants and Its Effect on Social Behavior in Childhood

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The purpose of the study is to investigate the relationship between infant behavior, environmental factors and later social behavior. The findings of the study were as follows:1. There is a dividing point at around 9 months of age during the developmental process from infant to childhood. 2. It is assumed that this dividing point is related to the transition from biological mechanism to social mechanism such as interaction with the environment. 3. Biological factors related to later social development are physical features such as head circumference and infant's temporal rhythms during mother-infant interaction. 4. Correlation between questionnaires for infant and social behaviors after enrollment in elementary school were being analyzed. 5. Cognitive reflection-impulsiveness is partly related to later developmental disorder.