There is a growing body of research emphasizing the role of social and endogenous motivations in human development. The present study evaluated canonical babbling across the second-half year of life using all-day recordings of 98 infants participating in a longitudinal study. Canonical babbling ratios were calculated from human coding along with Likert-scale ratings on vocal turn taking and vocal play in each segment. Ratios across all infants were significantly elevated during high turn taking and also during high vocal play. We conclude that both social and endogenous motivations may drive infants’ tendencies to produce their most advanced vocal forms.

中文翻译：

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声乐轮换和独立声乐演奏期间的规范咿呀声

越来越多的研究强调社会和内生动机在人类发展中的作用。本研究使用参与纵向研究的 98 名婴儿的全天记录评估了生命后半年的规范咿呀声。规范的咿呀声比率是根据人类编码以及每个片段中的声乐轮换和声乐播放的李克特量表评级计算得出的。所有婴儿的比率在高转轮和高声播放期间都显着升高。我们得出结论，社会和内生动机都可能促使婴儿倾向于产生最先进的声音形式。