Niwano Kaisuko, Sugai Kuniaki
Graduate School of Education, Tohoku University, Sendai, Japan.
Psychol Rep. 2002 Feb;90(1):83-90. doi: 10.2466/pr0.2002.90.1.83.
Generally, infants prefer infant-directed speech to adult-directed speech. This study investigated which acoustic features of maternal infant-directed speech elicit effectively 3-mo.-old infants' vocal response. The participants were 40 Japanese mother and infant dyads. Vocal f0 from the mother's speech and the infant's vocalization was extracted using Computerized Speech Laboratory (CSL4300) and custom software. The acoustical features measured were mean fundamental frequency (f0), and f0 contour. The rate of the infant's vocal response was significantly higher When the maternal infant-directed speech was terminated with a falling contour rather than a rising or flat contour. There was no significant difference between the mean f0 of the maternal infant-directed speech followed or not followed by the infant's vocal response. This suggests that the falling contour of terminal maternal infant-directed speech serves to elicit the 3-mo.-old infant's vocal response.
一般来说，婴儿更喜欢面向婴儿的言语而非面向成人的言语。本研究调查了母亲面向婴儿的言语的哪些声学特征能有效引发3个月大婴儿的发声反应。参与者为40对日本母婴。使用计算机语音实验室（CSL4300）和定制软件提取母亲言语和婴儿发声的基频（f0）。测量的声学特征为平均基频（f0）和f0轮廓。当母亲面向婴儿的言语以下降轮廓而非上升或平坦轮廓结束时，婴儿的发声反应率显著更高。婴儿发声反应前后母亲面向婴儿言语的平均f0之间没有显著差异。这表明母亲面向婴儿言语结尾的下降轮廓有助于引发3个月大婴儿的发声反应。
