Atypical neural functions underlying phonological processing and silent rehearsal in children who stutter
Atypical neural functions underlying phonological processing and silent rehearsal in children who stutter
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DOI：
10.1111/j.1467-7687.2008.00678.x
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发表时间：
2008-03-01
影响因子：
3.7
通讯作者：
Smith, Anne
中科院分区：
文献类型：
--
作者：
Weber-Fox, Christine;Spruill, John E., III;Smith, Anne
通过评估学龄期口吃儿童在视觉押韵任务中的表现和记录事件相关脑电位（ERPs）来研究其语音加工过程。结巴组在押韵判断上的准确性较低，但以押韵效应（RE） ERP为指标，结巴组和正常流利组的认知过程相似。因此，CWS对押韵判断的行为准确性较低不能归因于特定的加工阶段。相反，由启动词引发的N400和CNV以及目标词引发的N400所指示的RE前加工的神经功能表明，非典型加工可能导致CWS的押韵判断效率较低，准确性较低。基于目前的研究结果，似乎与语音排练和目标词预期相关的神经过程（由CNV索引）在这个年龄的CWS中是独特的。此外，正如N400所示，在语言整合发生的加工阶段，CWS的左右脑半球的相对贡献可能有所不同。综上所述，这些结果表明，CWS在预期目标呈现时可能不太能够形成和保持对启动时间和时间的稳定神经表征，这可能导致押韵判断的准确性较低。
Phonological processing was examined in school-age children who stutter (CWS) by assessing their performance and recording event-related brain potentials (ERPs) in a visual rhyming task. CWS had lower accuracy on rhyming judgments, but the cognitive processes that mediate the comparisons of the phonological representations of words, as indexed by the rhyming effect (RE) ERP, were similar for the stuttering and normally fluent groups. Thus the lower behavioral accuracy of rhyming judgments by the CWS could not be attributed to that particular stage of processing. Instead, the neural functions for processes preceding the RE, indexed by the N400 and CNV elicited by the primes and the N400 elicited by the targets, suggest atypical processing that may have resulted in less efficient, less accurate rhyming judgment for the CWS. Based on the present results, it seems likely that the neural processes related to phonological rehearsal and target word anticipation, as indexed by the CNV, are distinctive for CWS at this age. Further, it is likely that the relative contributions of the left and right hemispheres differ in CWS in the stage of processing when linguistic integration occurs, as indexed by the N400. Taken together, these results suggest that CWS may be less able to form and retain a stable neural representation of the prime onset and rime as they anticipate the target presentation, which may lead to lower rhyming judgment accuracy.