Cerebral responses to infant-directed speech and the effect of talker familiarity

Nozomi Naoi, Yasuyo Minagawa-Kawai, Ai Kobayashi, Koji Takeuchi, Katsuki Nakamura, Jun ichi Yamamoto, Shozo Kojima

研究成果: Article査読

75 被引用数 (Scopus)


A number of behavioral studies suggest that infant-directed speech (IDS) plays a more important role in facilitating both: a) speech perception, and b) adult-infant social interactions than does adult-directed speech (ADS), and hence that IDS contributes to subsequent social and language development. However neural substrates that may underlie these IDS functions have not been examined. The present study examined cerebral hemodynamic responses to IDS in 48 infants (4-13. months of age) using near-infrared spectroscopy (NIRS). Japanese sentences uttered by the infants' own mothers and by unfamiliar mothers were used to record activations in temporal and frontal area separately. Increased activations were observed predominantly in infants' left and right temporal areas when they listened to IDS rather than to ADS when both involved voices of their own and unfamiliar mothers. In contrast, significantly greater activations were observed in the frontal area when infants listened to IDS produced by their own mothers, not when IDS arose from unfamiliar mothers. Furthermore, the present results indicate that responses to IDS do vary as a function of the infant's age and the talker familiarity. These findings suggest a differential function for frontal and temporal areas in processing infant-directed speech by the different speakers.

出版ステータスPublished - 2012 1月 16

ASJC Scopus subject areas

  • 神経学
  • 認知神経科学


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