Neural responses to grammatically and lexically degraded speech.
Neural responses to grammatically and lexically degraded speech.
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DOI：
10.1080/23273798.2015.1123281
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Wilson SM
中科院分区：
文献类型：
--
作者：
Bautista A;Wilson SM
以各种方式降解的语言刺激已被用于神经成像研究，以揭示参与处理语言的不同大脑区域的不同角色。为了识别参与语法和词汇加工的不同大脑区域，我们对特定语素进行了光谱旋转，并操纵了语素顺序来创造语音刺激，这些刺激在语法或词汇上有所下降，但在可理解性上是匹配的。12名健康的参与者在听语法和词汇退化的刺激时进行了功能核磁共振扫描，并在熟悉的叙事背景下穿插着清晰的刺激。与我们的预期相反，我们没有发现任何对语法或词汇退化选择性敏感的大脑区域。然而，与以前的研究相比，无论哪种类型的退化，信号的减少都比预期的要少。这些发现可能反映了对由于熟悉的叙事语境而导致的退化刺激的更多关注，因为对退化语音的关注已经被证明减弱了通常与可理解性降低相关的信号减弱。
Linguistic stimuli that are degraded in various ways have been used in neuroimaging studies to uncover distinct roles for different brain regions involved in processing language. In order to identify brain regions differentially involved in grammatical and lexical processing, we spectrally rotated specific morphemes and manipulated morpheme order to create speech stimuli that were degraded either grammatically or lexically, yet were matched in intelligibility. Twelve healthy participants were scanned with functional MRI as they listened to the grammatically and lexically degraded stimuli, interspersed with clear stimuli in the context of a familiar narrative. Contrary to our expectations, we did not find any brain regions that were selectively sensitive to grammatical or lexical degradation. However, compared to previous studies, there was less signal reduction than anticipated in response to degradation of either type. These findings may reflect increased attention to the degraded stimuli due to the familiar narrative context, since attention to degraded speech has been shown to attenuate the signal decreases typically associated with reduced intelligibility.