Delgutte B, Kiang N Y
J Acoust Soc Am. 1984 Mar;75(3):887-96. doi: 10.1121/1.390598.
Responses of auditory-nerve fibers in anesthetized cats were recorded for synthetic voiceless fricative consonants. The four stimuli (/x/, /s/, /s/, and /f/) were presented at two levels corresponding to speech in which the levels of the vowels would be approximately 60 and 75 dB SPL, respectively. Discharge patterns were characterized in terms of PST histograms and their power spectra. For both stimulus levels, frequency regions in which the stimuli had considerable energy corresponded well with characteristic-frequency (CF) regions in which average discharge rates were the highest. At the higher level, the profiles of discharge rate against CF were more distinctive for the stimulus onset than for the central portion. Power spectra of PST histograms had large response components near fiber characteristic frequencies for CFs up to 3-4 kHz, as well as low-frequency components for all fibers. The relative amplitudes of these components varied for the different stimuli. In general, the formant frequencies of the fricatives did not correspond with the largest response components, except for formants below about 3 kHz. Processing schemes based on fine time patterns of discharge that were effective for vowel stimuli generally failed to extract the formant frequencies of fricatives.
记录了麻醉猫的听神经纤维对合成清擦音辅音的反应。四种刺激音（/x/、/s/、/ʃ/和/f/）以两个对应于元音水平分别约为60和75 dB SPL的语音水平呈现。放电模式通过PST直方图及其功率谱进行表征。对于两种刺激水平，刺激音具有相当能量的频率区域与平均放电率最高的特征频率（CF）区域吻合良好。在较高水平时，刺激音起始时放电率相对于CF的分布比中部更具特色。对于CF高达3 - 4 kHz的纤维，PST直方图的功率谱在纤维特征频率附近有较大的反应成分，并且所有纤维都有低频成分。这些成分的相对幅度因不同刺激音而异。一般来说，除了约3 kHz以下的共振峰外，擦音的共振峰频率与最大反应成分不对应。基于对元音刺激有效的精细放电时间模式的处理方案通常无法提取擦音的共振峰频率。
