Dichotic Word Recognition in Noise and the Right-Ear Advantage
Dichotic Word Recognition in Noise and the Right-Ear Advantage
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DOI：
10.1044/1092-4388(2010/09-0230
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发表时间：
2011-02-01
影响因子：
2.6
通讯作者：
Roup, Christina M.
中科院分区：
文献类型：
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作者：
Roup, Christina M.
目的：本研究试图在匹配整体识别表现水平后，比较年轻人的双耳右耳优势 (REA) 与老年人的数据（C. M. Roup、T. L. Wiley 和 R. H. Wilson，2006 年）。具体来说，引入语音频谱噪声是为了将年轻人的二分识别性能降低到与听力损失老年人一致的水平。方法：在自由回忆响应范式中，在两种条件下评估二分分词识别性能：(a) 安静和 (b) 噪声（+11 dB 信噪比）。参与者包括一组听力正常的右利手年轻人（n = 32）。结果：噪音的引入导致年轻人的双分词识别能力明显低于安静条件下的能力。然而，两种条件下的 REA 并无差异。相对于Roup等人。 (2006) 老年人数据显示，年轻人在噪声条件下的表现导致 (a) 总体识别表现水平相似，(b) REA 明显较小。结论：结果表明 REA 的大小并不依赖于二分任务的难度。相反，老年人表现出的大量 REA 更有可能与年龄相关的听觉处理缺陷有关。
Purpose: This study sought to compare dichotic right-ear advantages (REAs) of young adults to older adult data (C. M. Roup, T. L. Wiley, & R. H. Wilson, 2006) after matching for overall levels of recognition performance. Specifically, speech-spectrum noise was introduced in order to reduce dichotic recognition performance of young adults to a level consistent with that of older adults with hearing loss.Method: Dichotic word-recognition performance was evaluated in the free-recall response paradigm across 2 conditions: (a) quiet and (b) noise (+11 dB signal-to-noise ratio). Participants included a group of right-handed young adults (n = 32) with normal hearing.Results: The introduction of noise resulted in significantly poorer dichotic word-recognition performance than in the quiet condition for the young adults. REAs, however, did not differ between the 2 conditions. Relative to the Roup et al. (2006) older adult data, performance of the young adults in the noise condition resulted in (a) similar levels of overall recognition performance and (b) significantly smaller REAs.Conclusions: Results suggest that the magnitude of the REA is not dependent upon the difficulty of the dichotic task. Rather, the large REAs exhibited by older adults are more likely related to age-related deficits in auditory processing.