BCBL, Basque Center on Cognition, Brain and Language, Donostia, Spain.
The MARCS Institute for Brain, Behaviour and Development, Western Sydney University, Penrith, Australia.
Dev Sci. 2019 Nov;22(6):e12836. doi: 10.1111/desc.12836. Epub 2019 May 10.
Here we report, for the first time, a relationship between sensitivity to amplitude envelope rise time in infants and their later vocabulary development. Recent research in auditory neuroscience has revealed that amplitude envelope rise time plays a mechanistic role in speech encoding. Accordingly, individual differences in infant discrimination of amplitude envelope rise times could be expected to relate to individual differences in language acquisition. A group of 50 infants taking part in a longitudinal study contributed rise time discrimination thresholds when aged 7 and 10 months, and their vocabulary development was measured at 3 years. Experimental measures of phonological sensitivity were also administered at 3 years. Linear mixed effect models taking rise time sensitivity as the dependent variable, and controlling for non-verbal IQ, showed significant predictive effects for vocabulary at 3 years, but not for the phonological sensitivity measures. The significant longitudinal relationship between amplitude envelope rise time discrimination and vocabulary development suggests that early rise time discrimination abilities have an impact on speech processing by infants.
在这里，我们首次报告了婴儿对幅度包络上升时间的敏感性与他们后来的词汇发展之间的关系。听觉神经科学的最新研究表明，幅度包络上升时间在言语编码中起着机械作用。因此，可以预期婴儿对幅度包络上升时间的差异辨别能力与语言习得的个体差异有关。一组参与纵向研究的 50 名婴儿在 7 个月和 10 个月大时贡献了上升时间辨别阈值，他们的词汇发展在 3 岁时进行了测量。在 3 岁时还进行了语音敏感性的实验测量。以上升时间敏感性为因变量，控制非言语智商的线性混合效应模型显示，3 岁时词汇量有显著的预测作用，但语音敏感性测量指标没有。幅度包络上升时间辨别与词汇发展之间的显著纵向关系表明，早期的上升时间辨别能力对婴儿的言语处理有影响。
