Neural mismatch indices of vowel discrimination in monolingually and bilingually exposed infants: does attention matter?

Neural mismatch indices of vowel discrimination in monolingually and bilingually exposed infants: does attention matter?
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单语和双语婴儿元音辨别的神经失配指数:注意力重要吗?

DOI:
10.1016/j.neulet.2012.07.064
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发表时间:
2012-09-20
影响因子:
2.5
通讯作者:
Garrido-Nag K
Garrido-Nag K
中科院分区:
医学4区
文献类型:
--
作者:
Shafer VL;Yu YH;Garrido-Nag K

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对婴儿语言的神经生理学研究表明,失配反应(MMR)对以后的语言有预测价值。然而,它们的价值被削弱了,因为在不同的研究中可以看到MMR模式中无法解释的差异。本研究旨在通过记录6个月大的单语和双语暴露婴儿的十个元音的内部或末尾位置的事件相关电位(ERPs)来识别婴儿MMR的功能性质。与内部位置相比,最终位置的MMR(罕见减频)的负性增加,并与对最终位置的关注程度增加有关。这种模式有助于解释暴露在双语环境中的女婴对语音的总体上更大的负面影响。这些发现极大地促进了我们对言语知觉发展的神经指标的理解,并为进一步理解双语语言的发展提供了希望。
Neurophysiological studies of infant speech suggest that mismatch responses (MMRs) have predictive value for later language. Their value, however, is diminished because unexplained differences in the MMR patterns are seen across studies. The current study aimed to identify the functional nature of infant MMRs by recording event-related-potentials (ERPs) to an infrequent English vowel change in internal or final positions of a sequence of ten vowels in six-month-old monolingually- and bilingually-exposed infants. Increased negativity of the MMR (infrequent minus frequent) was found in final compared to internal positions and correlated with an index of increased attention to the final position. This pattern helps explain the overall greater negativity to the speech sounds in the bilingually-exposed female infants. These findings substantially advance our understanding of neural indices of speech perception development and show promise for furthering our understanding of bilingual language development.
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