Contrast tuning in auditory cortex
Contrast tuning in auditory cortex
复制标题
听觉皮质的对比度调谐
DOI：
10.1126/science.1080425
复制
发表时间：
2003-02-14
期刊：
影响因子：
56.9
通讯作者：
Wang, XQ
中科院分区：
文献类型：
--
作者：
Barbour, DL;Wang, XQ
对于将听觉信息转换为感知对象有用的声学特征知之甚少。尽管听觉皮层神经元被描述为窄调谐并优先响应窄带信号，但自然发生的声音通常是宽带的，具有独特的频谱能量分布。通过使用参数宽带声刺激，我们发现清醒的狨猴中的此类神经元对具有复杂频谱形状的宽带声音做出强烈反应，更喜欢高或低频谱对比度的刺激。低对比度偏好神经元不能用窄带刺激进行彻底研究，并且之前也没有被描述过。这些发现表明，频谱对比度反映了听觉皮层中重要的刺激分解，可能有助于声学物体的识别。
The acoustic features useful for converting auditory information into perceived objects are poorly understood. Although auditory cortex neurons have been described as being narrowly tuned and preferentially responsive to narrowband signals, naturally occurring sounds are generally wideband with unique spectral energy profiles. Through the use of parametric wideband acoustic stimuli, we found that such neurons in awake marmoset monkeys respond vigorously to wideband sounds having complex spectral shapes, preferring stimuli of either high or low spectral contrast. Low contrast-preferring neurons cannot be studied thoroughly with narrowband stimuli and have not been previously described. These findings indicate that spectral contrast reflects an important stimulus decomposition in auditory cortex and may contribute to the recognition of acoustic objects.