"Mom called me!" Behavioral and prefrontal responses of infants to self-names spoken by their mothers

Masahiro Imafuku, Yoko Hakuno, Mariko Uchida-Ota, Jun ichi Yamamoto, Yasuyo Minagawa

研究成果: Article査読

37 被引用数 (Scopus)

抄録

Development of a sense of self is a fundamental process needed for human social interaction. Although functional neuroimaging studies have revealed the importance of medial prefrontal cortex (mPFC) in self-referencing, how this function develops in infancy remains poorly understood. To determine the cerebral basis underlying processing of self-related stimuli, we used behavioral measures and functional multi-channel near-infrared spectroscopy (fNIRS) to measure prefrontal cortical responses in 6-month-old infants hearing their own names. We also investigated the influence of a mother's voice on name perception in infants - an ability that plays a crucial role in the recognition of social signals. Experiment 1 measured the behavioral preferences of infants for their own names and for other names, spoken either by their mothers or by strangers. Results showed that infants significantly preferred their own name to other names, regardless of speaker type. Experiment 2 examined hemodynamic responses to the same four conditions in the prefrontal cortex. Compared with other names, hearing their own names, especially when spoken by their mother, elicited greater activity in the infant's dorsal mPFC. Furthermore, the magnitude of the cerebral response correlated with the degree of behavioral preference only when involving their mother's voice. These findings suggest that, particularly in the context of their mothers' voice, the dorsal mPFC of infants is already sensitive to social signals related to self at 6. months. At the same time, familiarity and affection related processing are also discussed as possible factors modulating dorsal mPFC activation at this age.

本文言語English
ページ(範囲)476-484
ページ数9
ジャーナルNeuroImage
103
DOI
出版ステータスPublished - 2014 12 1

ASJC Scopus subject areas

  • 神経学
  • 認知神経科学

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