Social development of twins The need for intervention to avoid adverse effects of twin language

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  • 双生児の「こころ」の発達　Twin language に対する介入の意義
  • ソウセイジ ノ ココロ ノ ハッタツ Twin language ニ タイスル カイニュウ ノ イギ

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Abstract

 Social competence is one of the most important accomplishments of human development, and this skill in human relationships is learned through communication. Therefore, it is considered that delays in language development could be a barrier to building human relationships and social competence. Although it is well known that there are delays in language development in twins compared with that of singletons, little is known about how these linguistic delays affect the development of social competence. Because twin language is a language that is unique to each pair of twins and cannot be understood by either their mother or others, it may be assumed that the social competence of twins who have a twin language is less than that of twins who don't have a twin language. Therefore, in this prospective longitudinal study we also investigated the relationship between twin language and social competence.<br/> A mailed questionnaire survey was conducted in 958 mothers as a follow-up of a study conducted in 2004. As a result, 522 respondents returned the questionnaire (53.9%). In this study, we used only 256 twins aged 6-12 years old (school-age children) for analysis, excluding those with missing values. Multiple logistic regression analysis was employed.<br/> In the second child of twins, a low birth weight, the appearance of twin language and gestosis of the mother were positively related with social unbalance (OR=1.846, 2.022 and 1.903). On the other hand, with the first child, however, there was no such link.<br/> The present results indicate that twin language might influence social competence in school-age children. It has been believed that linguistic intervention is unnecessary, because most twin language disappears spontaneously. However, early intervention, for example linguistic assistance by public health nurses or psychologists and early enrollment in a preschool may be necessary for twins with a twin language, to avoid adverse consequences in social competence at school-age.

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