Department of Speech and Hearing Science, Arizona State University, Tempe, AZ 85258, USA.
Ear Hear. 2013 Mar-Apr;34(2):245-8. doi: 10.1097/AUD.0b013e318269ce70.
The authors describe the localization and speech-understanding abilities of a patient fit with bilateral cochlear implants (CIs) for whom acoustic low-frequency hearing was preserved in both cochleae.
Three signals were used in the localization experiments: low-pass, high-pass, and wideband noise. Speech understanding was assessed with the AzBio sentences presented in noise.
Localization accuracy was best in the aided, bilateral acoustic hearing condition, and was poorer in both the bilateral CI condition and when the bilateral CIs were used in addition to bilateral low-frequency hearing. Speech understanding was best when low-frequency acoustic hearing was combined with at least one CI.
The authors found that (1) for sound source localization in patients with bilateral CIs and bilateral hearing preservation, interaural level difference cues may dominate interaural time difference cues and (2) hearing-preservation surgery can be of benefit to patients fit with bilateral CIs.
作者描述了一位双侧人工耳蜗（CI）植入患者的定位和言语理解能力，该患者双侧耳蜗均保留低频听觉。
定位实验中使用了三种信号：低通、高通和宽带噪声。言语理解通过在噪声中呈现 AzBio 句子进行评估。
在辅助双侧听觉条件下，定位准确性最佳，在双侧 CI 条件下以及当双侧 CI 与双侧低频听觉结合使用时，定位准确性更差。当低频听觉与至少一个 CI 结合时，言语理解效果最佳。
作者发现，（1）对于双侧 CI 和双侧听力保留患者的声源定位，耳间水平差线索可能主导耳间时间差线索，（2）听力保护手术对双侧 CI 植入患者有益。
