Sinex Donal G, Guzik Heidi, Li Hongzhe, Henderson Sabes Jennifer
Department of Speech and Hearing Science, Arizona State University, Box 871908, Tempe, AZ 85287-1908, USA.
Hear Res. 2003 Aug;182(1-2):130-9. doi: 10.1016/s0378-5955(03)00189-8.
Responses of auditory nerve fibers were obtained to harmonic complex tones in which single components could be mistuned. Human listeners hear the harmonic tones as single sounds, but the same tones with one component mistuned are heard as two separate sounds. Fourier analysis of the temporal discharge patterns indicated that auditory nerve fibers typically responded to one or two stimulus components near the fibers' characteristic frequencies. At low stimulus levels, the discharge patterns could also exhibit low-frequency modulation that was produced by beating of two higher-frequency components. The same components were observed in the response spectra, whether those components were part of the original harmonic series or had been mistuned. The discharge patterns and response spectra were consistent with expectations based on previous studies of auditory nerve fibers with harmonic tones and other complex sounds. However, the discharge patterns differed dramatically from the discharge patterns elicited from inferior colliculus neurons by comparable stimuli.
研究获得了听神经纤维对复合谐音的反应，其中单个成分可能会失谐。人类听众将复合谐音听作单一声音，但其中一个成分失谐的相同音调则会被听作两个分开的声音。对时间发放模式的傅里叶分析表明，听神经纤维通常对纤维特征频率附近的一个或两个刺激成分做出反应。在低刺激水平下，发放模式还可能表现出由两个较高频率成分拍频产生的低频调制。在反应谱中观察到相同的成分，无论这些成分是原始谐波序列的一部分还是已经失谐。这些发放模式和反应谱与基于先前对听神经纤维对复合谐音和其他复杂声音研究的预期一致。然而，这些发放模式与由类似刺激引起的下丘神经元的发放模式有显著差异。
