Spanish-English bilingual families (N = 17) were recruited to assess the association between infant directed speech (IDS) in Spanish and their degree of neural commitment to the Spanish language. IDS was assessed by extracting the caregivers' Vowel Space Area (VSA) from recordings of a storybook reading task done at home. Infants' neural commitment was assessed by extracting the positive mismatch brain response (positive-MMR), an Event-Related Potential (ERP) thought to be indicative of higher attentional processes and early language commitment. A linear mixed model analysis demonstrated that caregivers' VSA predicted the amplitude of the positive-MMR in response to a native speech contrast (Spanish), but not to a non-native speech contrast (Chinese), even after holding other predictors constant (i.e., socioeconomic status, infants' age, and fundamental frequency). Our findings provide support to the view that quality of language exposure fosters language learning, and that this beneficial relationship expands to the bilingual population.

中文翻译：

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作为西班牙语婴儿定向语音 (IDS) 函数的语言学习：使用正 MMR 测试神经承诺

招募了西班牙语-英语双语家庭 (N = 17) 来评估婴儿西班牙语的定向语音 (IDS) 与他们对西班牙语的神经承诺程度之间的关联。通过从在家完成的故事书阅读任务的录音中提取护理人员的元音空间区域 (VSA) 来评估 IDS。婴儿的神经承诺是通过提取积极的错配大脑反应 (positive-MMR) 来评估的，这是一种事件相关电位 (ERP)，被认为表明更高的注意力过程和早期语言承诺。线性混合模型分析表明，即使在保持其他预测因子不变（即, 社会经济地位, 婴儿 年龄和基频）。我们的研究结果支持以下观点，即语言接触的质量促进语言学习，并且这种有益的关系扩展到双语人群。