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首页> 外文期刊>The European Journal of Neuroscience >Spectral summation and facilitation in on- and off-responses for optimized representation of communication calls in mouse inferior colliculus
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Spectral summation and facilitation in on- and off-responses for optimized representation of communication calls in mouse inferior colliculus

机译：在鼠标差基小组中的通信呼叫优化表示的开关和偏离响应中的光谱求和和促进

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摘要

Selectivity for processing of species-specific vocalizations and communication sounds has often been associated with the auditory cortex. The midbrain inferior colliculus, however, is the first center in the auditory pathways of mammals integrating acoustic information processed in separate nuclei and channels in the brainstem and, therefore, could significantly contribute to enhance the perception of species' communication sounds. Here, we used natural wriggling calls of mouse pups, which communicate need for maternal care to adult females, and further 15 synthesized sounds to test the hypothesis that neurons in the central nucleus of the inferior colliculus of adult females optimize their response rates for reproduction of the three main harmonics (formants) of wriggling calls. The results confirmed the hypothesis showing that average response rates, as recorded extracellularly from single units, were highest and spectral facilitation most effective for both onset and offset responses to the call and call models with three resolved frequencies according to critical bands in perception. In addition, the general on- and/or off-response enhancement in almost half the investigated 122 neurons favors not only perception of single calls but also of vocalization rhythm. In summary, our study provides strong evidence that critical-band resolved frequency components within a communication sound increase the probability of its perception by boosting the signal-to-noise ratio of neural response rates within the inferior colliculus for at least 20% (our criterion for facilitation). These mechanisms, including enhancement of rhythm coding, are generally favorable to processing of other animal and human vocalizations, including formants of speech sounds.
机译：用于处理物种特定声音和通信声音的选择性通常与听觉皮层相关联。然而，中脑下小股市是哺乳动物听觉途径中的第一中心，其在脑干中的单独核和通道中分成了处理的声学信息，因此可以显着促进对物种通信声音的看法。在这里，我们使用了鼠标幼仔的自然扭转呼叫，该呼叫沟通需要对成年女性的母体护理，并且进一步的15个合成的声音来测试成人女性下小粒子中的神经元的神经元优化其恢复率进行繁殖蠕动呼叫的三个主要谐波（汉语）。结果证实了该假设，显示的是，从单个单位的细胞外细胞内记录的平均响应速率最高，光谱促进最有效地对呼叫和呼叫呼叫的呼叫和呼叫模型，根据感知中的关键乐队，具有三个分辨频率的呼叫模型。此外，普通的和/或偏离响应增强在研究的122个神经元的几乎一半的增强不仅有利于对单一呼叫的看法，也是发声节奏的感知。总之，我们的研究提供了强有力的证据，即通信声态在通信中的临界频段分辨频率分量通过升压下小学内的神经响应率的信噪比至少为20％来增加其感知的可能性（我们的标准为了便利）。这些机制包括提高节律编码，通常有利于处理其他动物和人类发声，包括语音的汉语。

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