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首页> 外文期刊>The European Journal of Neuroscience >Contrast tuned responses in primary auditory cortex of the awake ferret.
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Contrast tuned responses in primary auditory cortex of the awake ferret.

机译：在清醒的雪貂的主听皮层中对比调整后的反应。

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摘要

Auditory neurons are often characterized by their spectro-temporal receptive field (STRF), a linear measure that captures overall trends of neural responses to modulations of the spectro-temporal envelopes of sounds. We have previously shown that primary auditory cortex neurons of the awake ferret are better characterized by STRFs followed by a non-trivial non-linearity. This non-linearity is a half-wave rectification followed by a squaring function, indicating that cortical neurons probably encode higher-order statistics of the spectrum of sounds. In this article, we introduce the concept of a contrast receptive field (CRF) and show that neurons in the auditory cortex encode quadratic statistics of the spectro-temporal envelope of sounds, which we call auditory contrast. We reveal phase-dependent contrast tuning in single units. Most units with a reliable STRF also possess a reliable CRF, such that the response to stimulus contrast complements the linear response described by the STRF. The relationship between the STRF and the CRF is analyzed in terms of orthogonality, co-localization in time-frequency, feature orientation selectivity, and output non-linearity interdependence. Our study shows that contrast can be used by auditory cortex neurons to sharpen, in a noise-resistant fashion, their responses to dynamic spectral profiles.
机译：听觉神经元通常以其频谱时域接受场（STRF）为特征，这是一种线性度量，可捕获神经对声音的频谱时域包络调制的整体响应趋势。先前我们已经表明，醒来的雪貂的初级听觉皮层神经元的特征在于STRFs，然后是非平凡的非线性。这种非线性是一个半波整流，后跟一个平方函数，表明皮质神经元可能编码声音频谱的高阶统计量。在本文中，我们介绍了对比度接收场（CRF）的概念，并表明听觉皮层中的神经元编码声音的时空包络的二次统计量，我们称之为听觉对比度。我们揭示了单个单元中相位相关的对比度调整。具有可靠STRF的大多数设备还具有可靠的CRF，因此对刺激对比的响应补充了STRF描述的线性响应。从正交性，时频共定位，特征方向选择性和输出非线性相互依赖性方面分析了STRF和CRF之间的关系。我们的研究表明，听觉皮层神经元可以使用反差来以抗噪的方式增强其对动态光谱图的响应。

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