Dubno J R, Dorman M F
Division of Head and Neck Surgery, UCLA School of Medicine 90024.
J Acoust Soc Am. 1987 Nov;82(5):1503-11. doi: 10.1121/1.395194.
The identification of front vowels was studied in normal-hearing listeners using stimuli whose spectra had been altered to approximate the spectrum of vowels processed by auditory filters similar to those that might accompany sensorineural hearing loss. In the first experiment, front vowels were identified with greater than 95% accuracy when the first formant was specified in a normal manner and the higher frequency formants were represented by a broad, flat spectral plateau ranging from approximately 1600 to 3500 Hz. In the second experiment, the bandwidth of the first formant was systematically widened for stimuli with already flattened higher frequency formants. Normal vowel identification was preserved until the first formant was widened to six times its normal bandwidth. These results may account for the coexistence of abnormal vowel masking patterns (indicating flattened auditory spectra) and normal vowel recognition.
使用经过频谱改变的刺激，对听力正常的受试者识别前元音的能力进行了研究，这些刺激的频谱已被改变，以近似于由类似于感音神经性听力损失可能伴随的听觉滤波器处理的元音频谱。在第一个实验中，当第一共振峰以正常方式指定，且较高频率共振峰由大约1600至3500赫兹的宽而平坦的频谱平台表示时，前元音的识别准确率高于95%。在第二个实验中，对于已经具有平坦高频共振峰的刺激，第一共振峰的带宽被系统地加宽。在第一共振峰加宽至其正常带宽的六倍之前，正常的元音识别得以保留。这些结果可能解释了异常元音掩蔽模式（表明听觉频谱平坦）与正常元音识别并存的现象。
