Early ERP Signature of Hearing Impairment in Visual Rhyme Judgment.
Early ERP Signature of Hearing Impairment in Visual Rhyme Judgment.
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DOI：
10.3389/fpsyg.2013.00241
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发表时间：
2013
影响因子：
3.8
通讯作者：
Rönnberg J
中科院分区：
文献类型：
--
作者：
Classon E;Rudner M;Johansson M;Rönnberg J
语言后获得性听力障碍(HI)与语义长时记忆中声音表征的变化有关。这一点的一个迹象是，在语音和正字法线索不匹配的条件下，视觉押韵判断任务的表现较差，需要高度依赖语音表征。本研究首次采用事件相关电位(ERPs)研究了后天HI和听力正常受试者视觉押韵判断中语音加工的神经关联。押韵任务词对是否押韵，是否有匹配或不匹配的拼写。此外，刺激间期(ISI)被操纵为长(800 ms)或短(50 ms)。长的ISIS允许参与显性的、自上而下的进程，而短的ISI限制了此类机制的参与。我们假设，在错配押韵判断条件下，特别是在短ISI条件下，HI的行为表现较差，N400和N2偏差较大。然而，结果显示了不同的模式。正如预期的那样，在短ISI中，在错配条件下，HI组的行为表现低于NH组，但ERPs在不同组之间没有差异。相比之下，在长ISI中，HI的表现与NH相当。此外，在长ISI中，HI而不是NH在非押韵、正字法不匹配的条件下显示出放大的类N_2反应。这也是押韵的条件，在这种情况下，两组的参与者都从参与自顶向下的过程的可能性中受益最多，这是较长的ISI所提供的。综上所述，这些结果表明在这项具有挑战性的语音任务中，HI的早期事件相关电位特征，可能反映了补偿策略的使用。这一策略建议增加对发音重新编码和字素到音素转换等显性机制的依赖。
Postlingually acquired hearing impairment (HI) is associated with changes in the representation of sound in semantic long-term memory. An indication of this is the lower performance on visual rhyme judgment tasks in conditions where phonological and orthographic cues mismatch, requiring high reliance on phonological representations. In this study, event-related potentials (ERPs) were used for the first time to investigate the neural correlates of phonological processing in visual rhyme judgments in participants with acquired HI and normal hearing (NH). Rhyme task word pairs rhymed or not and had matching or mismatching orthography. In addition, the inter-stimulus interval (ISI) was manipulated to be either long (800 ms) or short (50 ms). Long ISIs allow for engagement of explicit, top-down processes, while short ISIs limit the involvement of such mechanisms. We hypothesized lower behavioral performance and N400 and N2 deviations in HI in the mismatching rhyme judgment conditions, particularly in short ISI. However, the results showed a different pattern. As expected, behavioral performance in the mismatch conditions was lower in HI than in NH in short ISI, but ERPs did not differ across groups. In contrast, HI performed on a par with NH in long ISI. Further, HI, but not NH, showed an amplified N2-like response in the non-rhyming, orthographically mismatching condition in long ISI. This was also the rhyme condition in which participants in both groups benefited the most from the possibility to engage top-down processes afforded with the longer ISI. Taken together, these results indicate an early ERP signature of HI in this challenging phonological task, likely reflecting use of a compensatory strategy. This strategy is suggested to involve increased reliance on explicit mechanisms such as articulatory recoding and grapheme-to-phoneme conversion.
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