Department for Hearing, Speech and Voice Disorders, Medical University of Innsbruck, Innsbruck, Austria.
Saxonian Cochlear Implant Center, Department of Otorhinolaryngology, Technical University of Dresden, Dresden, Germany.
Int J Audiol. 2023 Jan;62(1):71-78. doi: 10.1080/14992027.2022.2030496. Epub 2022 Feb 1.
Localisation of low- and high-frequency sounds in single-sided deaf cochlear implant users was investigated using noise stimuli designed to mitigate monaural localisation cues.
Within subject design. Sound source localisation was tested in the horizontal plane using an array of seven loudspeakers along the azimuthal angle span from -90° to +90°. Stimuli were broadband noise and high- and low-frequency noise.
Twelve adult subjects with single-sided deafness participated in the study. All had normal hearing in the healthy ear and were supplied with a cochlear implant (CI) in their deaf ear.
With broadband noise, the mean angular localisation error was 39° in aided condition as compared to a median angular error of 83.6° when the speech processor was not worn. For high-frequency noise, the median angular error was 30° and for low-frequency noise, it was 46° in the CI-aided condition.
Single-sided deaf CI users show the best sound localisation for high-frequency sounds. This supports the view that interaural level differences are dominant for sound localisation in these listeners. Nonetheless, a limited ability to localise low-frequency sounds was observed, which may be based on the supportive perception of interaural time differences.
使用旨在减轻单耳定位线索的噪声刺激，研究单侧聋人工耳蜗植入者的低频和高频声音定位。
受试者内设计。声源定位在水平面上使用沿方位角跨度从-90°到+90°的七个扬声器阵列进行测试。刺激为宽带噪声以及高低频噪声。
12 名单侧聋成年受试者参与了这项研究。所有受试者在健侧耳均具有正常听力，并在聋侧耳植入了人工耳蜗（CI）。
在使用宽带噪声时，辅助条件下的平均角度定位误差为 39°，而不佩戴言语处理器时的中位数角度误差为 83.6°。对于高频噪声，中位数角度误差为 30°，对于低频噪声，在 CI 辅助条件下为 46°。
单侧聋 CI 用户对高频声音的声音定位效果最佳。这支持了这样一种观点，即对于这些听众来说，双耳水平差异是声音定位的主导因素。尽管如此，仍观察到低频声音定位能力有限，这可能基于对双耳时间差异的支持性感知。
