Sinex Donal G, Henderson Jennifer, Li Hongzhe, Chen Guang-Di
Department of Speech and Hearing Science, Arizona State University, Tempe, AZ 85287-1908, USA.
J Assoc Res Otolaryngol. 2002 Dec;3(4):390-402. doi: 10.1007/s101620020026. Epub 2002 Feb 27.
Responses of single neurons in the inferior colliculus of the chinchilla to amplitude-modulated tones were obtained. In one condition, the modulating waveform was a low-frequency sinusoid (SAM tone). In the other, the modulator was a trapezoid with fixed parameters, used to create trains of brief tone bursts presented at various repetition rates (TRAM tone). Modulation frequency (or repetition rate) was varied over the range from 10 to 200 Hz. Many individual neurons exhibited strong selectivity for modulator type. Neurons with pauser discharge patterns to steady-state tones usually exhibited greater responsiveness to SAM tones than to TRAM. In contrast, neurons that responded transiently to steady-state tones usually exhibited greater responsiveness to TRAM tones than to SAM. Neurons with sustained responses to steady-state tones responded strongly to both types of modulated tones. The selectivity for modulator type suggests that transient neurons may play a different functional role in the representation of envelopes than do other types of neurons.
获得了灰鼠下丘中单个神经元对调幅音的反应。在一种情况下，调制波形是低频正弦波（SAM音）。在另一种情况下，调制器是具有固定参数的梯形，用于创建以各种重复率呈现的短音突发序列（TRAM音）。调制频率（或重复率）在10至200Hz范围内变化。许多单个神经元对调制器类型表现出强烈的选择性。对稳态音具有暂停放电模式的神经元通常对SAM音的反应比对TRAM音的反应更强。相反，对稳态音有瞬时反应的神经元通常对TRAM音的反应比对SAM音的反应更强。对稳态音有持续反应的神经元对两种类型的调制音都有强烈反应。对调制器类型的选择性表明，瞬时神经元在包络表示中可能比其他类型的神经元发挥不同的功能作用。
