Virginia Merrill Bloedel Hearing Research Center, Department of Otolaryngology-Head and Neck Surgery, University of Washington, Seattle, Washington 98195, USA.
J Acoust Soc Am. 2011 Oct;130(4):2088-97. doi: 10.1121/1.3624820.
Spectral-ripple discrimination has been used widely for psychoacoustical studies in normal-hearing, hearing-impaired, and cochlear implant listeners. The present study investigated the perceptual mechanism for spectral-ripple discrimination in cochlear implant listeners. The main goal of this study was to determine whether cochlear implant listeners use a local intensity cue or global spectral shape for spectral-ripple discrimination. The effect of electrode separation on spectral-ripple discrimination was also evaluated. Results showed that it is highly unlikely that cochlear implant listeners depend on a local intensity cue for spectral-ripple discrimination. A phenomenological model of spectral-ripple discrimination, as an "ideal observer," showed that a perceptual mechanism based on discrimination of a single intensity difference cannot account for performance of cochlear implant listeners. Spectral modulation depth and electrode separation were found to significantly affect spectral-ripple discrimination. The evidence supports the hypothesis that spectral-ripple discrimination involves integrating information from multiple channels.
声纹辨别已被广泛应用于正常听力、听力受损和人工耳蜗植入者的听觉心理研究。本研究旨在探讨人工耳蜗植入者对声纹辨别的感知机制。本研究的主要目的是确定人工耳蜗植入者是否使用局部强度线索或全局频谱形状进行声纹辨别。还评估了电极分离对声纹辨别能力的影响。结果表明，人工耳蜗植入者不太可能依赖于局部强度线索进行声纹辨别。作为“理想观察者”的声纹辨别现象模型表明，基于单个强度差异的辨别感知机制不能解释人工耳蜗植入者的表现。发现频谱调制深度和电极分离显著影响声纹辨别。这一证据支持了这样一种假设，即声纹辨别涉及从多个通道整合信息。
