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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Masking and scrambling in the auditory thalamus of awake rats by Gaussian and modulated noises
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Masking and scrambling in the auditory thalamus of awake rats by Gaussian and modulated noises

机译：高斯和调制噪声掩盖和扰乱清醒大鼠的听丘脑。

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摘要

This paper provides a look at how modulated broad-band noises modulate the thalamic response evoked by brief probe sounds in the awake animal. We demonstrate that noise not only attenuates the response to probe sounds (masking) but also changes the temporal response pattern (scrambling). Two brief probe sounds, a Gaussian noise burst and a brief sinusoidal tone, were presented in silence and in three ongoing noises. The three noises were targeted at activating the auditory system in qualitatively distinct ways. Dynamic ripple noise, containing many random tone-like elements, is targeted at those parts of the auditory system that respond well to tones. International Collegium of Rehabilitative Audiology noise, comprised of the sum of several simultaneous streams of Schroeder-phase speech, is targeted at those parts of the auditory system that respond well to modulated sounds but lack a well defined response to tones. Gaussian noise is targeted at those parts of the auditory system that respond to acoustic energy regardless of modulation. All noises both attenuated and decreased the precise temporal repeatability of the onset response to probe sounds. In addition, the modulated noises induced context-specific changes in the temporal pattern of the response to probe sounds. Scrambling of the temporal response pattern may be a direct neural correlate of the unfortunate experience of being able to hear, but not understand, speech sounds in noisy environments.
机译：本文探讨了调制后的宽带噪声如何调节清醒动物短暂的探头声音引起的丘脑反应。我们证明，噪声不仅会减弱对探测声音的响应（掩盖），而且会改变时间响应模式（加扰）。在无声和三种持续的声音中呈现了两个简短的探测声音，即高斯噪声爆发和简短的正弦音调。这三种噪音旨在以质的不同方式激活听觉系统。包含许多随机音调元素的动态波纹噪声针对听觉系统中对音调响应良好的那些部分。国际康复听觉病学研讨会的噪声由施罗德相位语音的多个同时流组成，其目标是听觉系统中对调制声音响应良好但对音调缺乏明确响应的那些部分。高斯噪声的目标是听觉系统的那些对声能做出响应的部分，而与调制无关。所有噪声都减弱并降低了对探头声音的开始响应的精确时间重复性。此外，调制后的噪声会引起对探测声音的响应的时间模式的特定于上下文的变化。时间响应模式的加扰可能是在嘈杂环境中能够听到但听不懂语音的不幸经历的直接神经相关因素。

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