Little is known about infants' ability to deal with commonly encountered situations in which speech from one individual occurs simultaneously with that of others. Previous research has shown that while age of the infant and intensity of the background matter, so does the number of background speakers. The read-aloud multi-talker speech used in previous studies is perceptually different from conversational speech typically encountered by infants. To test generalizability, this study used a background of ecologically valid multi-talker speech. Using the head-turn preference procedure, infants were presented with passages of background noise with and without target infant-directed speech at a 10 dB SNR. Results show that while 9-month-olds prefer passages containing target speech with a white noise background, both 9- and 12-month-olds failed to show a preference with a multi-talker background. This inability to segregate speech streams under ecologically valid conditions demonstrates the adversity infants face to learn their community's language.
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机译：对于婴儿应对一个人与另一个人同时讲话的常见情况的能力知之甚少。先前的研究表明，尽管婴儿的年龄和背景物质的强度，背景说话者的数量也是如此。先前研究中使用的朗读多方讲话者的语音与婴儿通常会遇到的会话性语音在感觉上有所不同。为了测试通用性，本研究使用了具有生态学意义的多说话者语音背景。使用转头偏爱程序，以10 dB SNR在有和没有目标婴儿指导语音的情况下向婴儿展示了背景噪声的经过。结果表明，尽管9个月大的孩子喜欢带有目标语音且带有白噪声背景的段落，但是9个月和12个月大的孩子都没有表现出多说话者背景的偏好。这种无法在生态有效的条件下隔离语音流的现象证明了婴儿在学习社区语言时所面临的困境。
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