Frequency response areas of mouse inferior colliculus neurons: II. Critical bands
Frequency response areas of mouse inferior colliculus neurons: II. Critical bands
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DOI：
10.1097/01.wnr.0000239966.29308.fb
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发表时间：
2006-11-27
期刊：
影响因子：
1.7
通讯作者：
Ehret, Guenter
中科院分区：
文献类型：
--
作者：
Egorova, Marina;Vartanyan, Inna;Ehret, Guenter
临界频带是感知滤波器，用于检测和分离复杂声音中的频谱峰值。在这里，我们表明，在窄带噪声掩蔽测试（种属特异性频率依赖性和强度独立性的：带宽）中测得的主要属性的心理学定义的临界频带，存在于单个神经元的小鼠下丘中央核。临界带的带宽平均为神经元特征频率的3/8-1/3倍频程。它们不是由神经元兴奋性感受野的形状决定的。这些结果支持了听觉系统的频率分辨率在听觉中脑的主要核团中形成其感知水平的观点。
Critical bands are perceptual filters that detect and separate spectral peaks in complex sounds. Here, we show that the main properties of psychophysically defined critical bands, as measured in narrow-band noise masking tests (species-specific frequency dependence and intensity independence of the: bandwidths), are present in single neurons of the mouses central nucleus of the inferior colliculus. Bandwidths of critical bands amount to, on average, 3/8-1/3 octave related to the neurons' characteristic frequencies. They are not determined by the shapes of the neurons' excitatory receptive fields. The results support the view that frequency resolution in the auditory system is shaped to its perceptual level in the main nucleus of the auditory midbrain.