Theta oscillations mediate pre-activation of highly expected word initial phonemes
Theta oscillations mediate pre-activation of highly expected word initial phonemes
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Theta 振荡介导高度期待的单词首字母音素的预激活
DOI：
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发表时间：
2018
影响因子：
4.6
通讯作者：
Nicola Molinaro
中科院分区：
文献类型：
--
作者：
I. F. Monsalve;M. Bourguignon;Nicola Molinaro
预测被认为是一种基本的神经认知机制。然而，它在语言理解中的作用目前仍有争议。在这项脑磁图研究中，我们的目的是寻找证据的单词形式的语音预激活和表征的振荡机制支持这一点。参与者首先看到一个物体的图片，然后，经过一段时间（固定或可变），他们听到相应的单词。目标词可以包含一个音素替代，参与者的任务是检测发音错误。词首音素摩擦音或爆破音，产生两个实验条件（预期摩擦和预期爆破）。在词前间隔，固定和可变延迟条件之间出现显著差异（α = 0.05）。这种效果的源重建显示了一个全脑网络，涉及几个频带，包括双边上级颞区通常与语音处理，在θ范围。这些结果表明，语音表征支持的θ带可能是活跃的词发病前，即使在时间的不确定性。然而，在诱发反应之前的话，条件之间的差异是明显的可变的-但不是固定的-延迟。这表明，额外的自上而下的机制敏感的语音形式可能会被招募时，有不确定性的信号。
Prediction has been proposed to be a fundamental neurocognitive mechanism. However, its role in language comprehension is currently under debate. In this magnetoencephalography study we aimed to find evidence of word-form phonological pre-activation and to characterize the oscillatory mechanisms supporting this. Participants were presented firstly with a picture of an object, and then, after a delay (fixed or variable), they heard the corresponding word. Target words could contain a phoneme substitution, and participants’ task was to detect mispronunciations. Word-initial phonemes were either fricatives or plosives, generating two experimental conditions (expect-fricative and expect-plosive). In the pre-word interval, significant differences (α = 0.05) emerged between conditions both for fixed and variable delays. Source reconstruction of this effect showed a brain-wide network involving several frequency bands, including bilateral superior temporal areas commonly associated with phonological processing, in a theta range. These results show that phonological representations supported by the theta band may be active before word onset, even under temporal uncertainty. However, in the evoked response just prior to the word, differences between conditions were apparent under variable- but not fixed-delays. This suggests that additional top-down mechanisms sensitive to phonological form may be recruited when there is uncertainty in the signal.
影响因子：
33.6
作者：
Wang XJ
通讯作者：
Wang XJ
DOI：
10.1080/23273798.2015.1102299
发表时间：
2016
期刊：
Language, cognition and neuroscience
影响因子：
--
作者：
Kuperberg GR;Jaeger TF
通讯作者：
Jaeger TF