双耳时间延迟对双侧人工耳蜗使用者噪声中言语感知的影响

文献信息

中文摘要

目的： 精确的双耳时间与强度线索对空间听觉和噪声中言语理解至关重要。双侧人工耳蜗（CI）使用者提供了一个受控模型，用于研究人为引入的双耳时间差异如何影响双耳听觉。本研究探讨在CI刺激中引入单侧时间延迟是否会影响噪声中言语感知和空间掩蔽释放（SRM）。
方法： 11名双侧CI使用者使用德语奥尔登堡句子测试（OLSA）在三种空间噪声条件下（S0N0、S0N+90、S0N-90）进行测试，分别在有和没有对右侧CI处理器引入10 ms延迟的情况下。使用重复测量方差分析分析言语接受阈（SRT）和SRM。
结果： 在所有空间配置中，延迟条件与非延迟条件之间的SRT或SRM均未发现显著差异。观察到一致的右耳优势，但诱导的双耳延迟并未显著损害噪声中言语表现。
结论： 在双侧CI使用者中，单侧10 ms的CI刺激延迟不会显著影响言语感知或SRM。这些发现表明，单侧10 ms的双耳延迟不会可测量地影响双侧CI使用者的言语感知或空间掩蔽释放。这一观察与先前报告一致，提示在噪声中言语处理过程中对精细双耳时间线索的功能性使用有限，尽管本研究无法就较小的双耳延迟得出结论。

英文摘要

PURPOSE: Precise interaural timing and level cues are critical for spatial hearing and speech understanding in noise. Bilateral cochlear implant (CI) users provide a controlled model to investigate how artificially introduced interaural timing disparities affect binaural hearing. This study investigates whether introducing a unilateral time delay in CI stimulation affects speech perception in noise and spatial release from masking (SRM).
METHODS: Eleven bilateral CI users were tested using the German Oldenburger sentence test (OLSA) under three spatial noise conditions (S0N0, S0N+90, S0N-90), with and without a 10 ms delay introduced to the right CI processor. Speech reception thresholds (SRTs) and SRM were analyzed using repeated-measures ANOVA.
RESULTS: No significant differences in SRT or SRM were found between the delay and non-delay conditions across all spatial configurations. A consistent right-ear advantage was observed, but the induced interaural delay did not significantly impair speech-in-noise performance.
CONCLUSION: A unilateral 10 ms delay in CI stimulation does not significantly affect speech perception or SRM in bilateral CI users. These findings indicate that a unilateral 10 ms interaural delay does not measurably affect speech perception or spatial release from masking in bilateral CI users. This observation is consistent with previous reports suggesting limited functional use of fine-grained interaural timing cues during speech-in-noise processing, although the present study cannot draw conclusions about smaller interaural delays.