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首页> 外文期刊>Journal of Neurophysiology >Processing of fast amplitude modulations in bat auditory cortex matches communication call-specific sound features
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Processing of fast amplitude modulations in bat auditory cortex matches communication call-specific sound features

机译：在BAT听觉Cortex中处理快速幅度调制与特定于通信呼叫特定声音功能

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摘要

Bats use a large repertoire of calls for social communication. In the bat Phyllostomus discolor, social communication calls are often characterized by sinusoidal amplitude and frequency modulations with modulation frequencies in the range of 100-130 Hz. However, peaks in mammalian auditory cortical modulation transfer functions are typically limited to modulation frequencies below 100 Hz. We investigated the coding of sinusoidally amplitude modulated sounds in auditory cortical neurons in P. discolor by constructing rate and temporal modulation transfer functions. Neuronal responses to playbacks of various communication calls were additionally recorded and compared with the neurons' responses to sinusoidally amplitude-modulated sounds. Cortical neurons in the posterior dorsal field of the auditory cortex were tuned to unusually high modulation frequencies: rate modulation transfer functions often peaked around 130 Hz (median: 87 Hz), and the median of the highest modulation frequency that evoked significant phase-locking was also 130 Hz. Both values are much higher than reported from the auditory cortex of other mammals, with more than 51% of the units preferring modulation frequencies exceeding 100 Hz. Conspicuously, the fast modulations preferred by the neurons match the fast amplitude and frequency modulations of prosocial, and mostly of aggressive, communication calls in P. discolor. We suggest that the preference for fast amplitude modulations in the P. discolor dorsal auditory cortex serves to reliably encode the fast modulations seen in their communication calls.
机译：蝙蝠使用大量的呼吁进行社交沟通。在蝙蝠植物肺泡褪色中，社交通信呼叫通常是以100-130Hz的范围内的调制频率的正弦幅度和频率调制。然而，哺乳动物听觉皮质调制传递函数中的峰通常限于100Hz以下的调制频率。通过构建速率和时间调制传递函数，我们研究了P.褪色中的听觉皮质神经元中正弦幅度调制声音的编码。另外记录对各种通信呼叫的回放的神经元响应，并与神经元对正弦幅度调制声音的响应进行比较。检测皮质后部面部的皮质神经元调整为异常高的调制频率：速率调制转移功能经常达到130 Hz（中位数：87Hz），以及唤起显着阶段锁定的最高调制频率的中位数是也是130 Hz。两个值远高于其他哺乳动物的听觉皮层报告的，超过51％的单位优于超过100Hz的调制频率。显着地，神经元优选的快速调制与P.褪色中的Prosocial的快速​​幅度和频率调制匹配，大多是侵略性的通信呼叫。我们建议，P.褪色背面听觉Cortex中的快速幅度调制的偏好用于可靠地编码其通信调用中看到的快速调制。

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