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首页> 外文期刊>The European Journal of Neuroscience >Brain responses to audiovisual speech mismatch in infants are associated with individual differences in looking behaviour
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Brain responses to audiovisual speech mismatch in infants are associated with individual differences in looking behaviour

机译：婴儿对视听语音不匹配的大脑反应与外表行为的个体差异有关

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Research on audiovisual speech integration has reported high levels of individual variability, especially among young infants. In the present study we tested the hypothesis that this variability results from individual differences in the maturation of audiovisual speech processing during infancy. A developmental shift in selective attention to audiovisual speech has been demonstrated between 6 and 9 months with an increase in the time spent looking to articulating mouths as compared to eyes (Lewkowicz & Hansen-Tift. (2012) Proc. Natl Acad. Sci. USA, 109, 1431-1436; Tomalski et al. (2012) Eur. J. Dev. Psychol., 1-14). In the present study we tested whether these changes in behavioural maturational level are associated with differences in brain responses to audiovisual speech across this age range. We measured high-density event-related potentials (ERPs) in response to videos of audiovisually matching and mismatched syllables /ba/ and /ga/, and subsequently examined visual scanning of the same stimuli with eye-tracking. There were no clear age-specific changes in ERPs, but the amplitude of audiovisual mismatch response (AVMMR) to the combination of visual /ba/ and auditory /ga/ was strongly negatively associated with looking time to the mouth in the same condition. These results have significant implications for our understanding of individual differences in neural signatures of audiovisual speech processing in infants, suggesting that they are not strictly related to chronological age but instead associated with the maturation of looking behaviour, and develop at individual rates in the second half of the first year of life.
机译：视听语音整合研究表明，个体变异性很高，尤其是在婴儿中。在本研究中，我们检验了以下假设：这种可变性是由婴儿期视听语音处理成熟度的个体差异引起的。在6到9个月之间，对视听语音的选择性注意力已经发生了发展变化，与眼睛相比，在咬嘴上花费的时间增加了（Lewkowicz＆Hansen-Tift。（2012）Proc。Natl Acad。Sci。USA ，109，1431-1436; Tomalski等人（2012）Eur.J.Dev.Psychol。，1-14）。在本研究中，我们测试了行为成熟水平的这些变化是否与该年龄段的大脑对视听语音的反应差异有关。我们针对视听匹配/不匹配的音节/ ba /和/ ga /的视频，测量了高密度事件相关电位（ERP），然后通过眼动追踪检查了相同刺激的视觉扫描。在ERPs中没有明确的针对年龄的变化，但是在相同条件下，视听/ ba /和听觉/ ga /的组合所引起的视听失配响应（AVMMR）的幅度与嘴巴看时间强烈地负相关。这些结果对我们理解婴儿视听语音处理的神经特征的个体差异具有重要意义，表明它们与时间年龄不严格相关，而是与外观行为的成熟相关，并在下半年以个体速率发展第一年的生活

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