Cochlear Implants and Psychophysics Laboratory, Department of Hearing and Speech Sciences, The University of Maryland, College Park, Maryland 20742, USA.
J Acoust Soc Am. 2010 Feb;127(2):EL37-41. doi: 10.1121/1.3284544.
Cochlear implant (CI) and normally hearing (NH) listeners' recognition of periodically interrupted sentences was investigated. CI listeners' scores declined drastically when the sentences were interrupted. The NH listeners showed a significant decline in performance with increasing spectral degradation using CI-simulated, noise-band-vocoded speech. It is inferred that the success of top-down processes necessary for the perceptual reconstruction of interrupted speech is limited by even mild degradations of the bottom-up information stream (16 and 24 band processing). A hypothesis that the natural voice-pitch variations in speech would help in the perceptual reconstruction of the sentences was not supported by experimental results.
研究了人工耳蜗（CI）植入者和正常听力（NH）者对周期性中断句子的识别。当句子中断时，CI 听者的得分急剧下降。使用 CI 模拟的噪声带编码语音，随着频谱退化程度的增加，NH 听者的表现明显下降。可以推断，即使是对自下而上信息流的轻微降级（16 带和 24 带处理），也会限制用于中断语音感知重建的自上而下过程的成功。实验结果不支持这样一种假设，即语音中的自然音高变化有助于句子的感知重建。
