A bilateral advantage for diotically presented stimuli has been observed for cochlear implant (CI) users and is suggested to be dependent on symmetrical implant performance. Studies using CI simulations have not shown a true "bilateral" advantage, but a "better ear" effect and have demonstrated that performance decreases with increasing basalward shift in insertion depth. This study aimed to determine whether there is a bilateral advantage for CI simulations with interaurally matched insertions and the extent to which performance is affected by interaural insertion depth mismatch. Speech perception in noise and self-reported ease of listening were measured using matched bilateral, mismatched bilateral and unilateral CI simulations over four insertion depths for seventeen normal hearing listeners. Speech scores and ease of listening reduced with increasing basalward shift in (interaurally matched) insertion depth. A bilateral advantage for speech perception was only observed when the insertion depths were interaurally matched and deep. No advantage was observed for small to moderate interaural insertion-depth mismatches, consistent with a better ear effect. Finally, both measures were poorer than expected for a better ear effect for large mismatches, suggesting that misalignment of the electrode arrays may prevent a bilateral advantage and detrimentally affect perception of diotically presented speech.

译文

对于人工耳蜗 (CI) 使用者,已经观察到双向呈现刺激的双边优势,并且建议这取决于对称的植入性能。使用CI模拟的研究并未显示出真正的 “双边” 优势,而是 “更好的耳朵” 效果,并且表明性能会随着插入深度的玄武向偏移而降低。这项研究旨在确定使用耳间匹配插入的CI模拟是否具有双边优势,以及耳间插入深度不匹配对性能的影响程度。使用匹配的双侧,不匹配的双侧和单侧CI模拟,对17名正常听力听众在四个插入深度上测量了噪声中的语音感知和自我报告的听力难易程度。随着 (耳间匹配) 插入深度的basalward偏移的增加,语音分数和听力的难易程度会降低。仅当插入深度在耳间匹配且较深时,才观察到语音感知的双边优势。对于小到中等的耳间插入深度不匹配,没有观察到优势,这与更好的耳朵效果一致。最后,这两种措施都比预期的要差,因为对于较大的不匹配,耳朵效果更好,这表明电极阵列的不对准可能会阻止双边优势,并不利地影响对语音呈现的感知。

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