In amphibians, there is some evidence that (1) anatomically separate brainstem respiratory oscillators are involved in rhythm generation, one for the buccal rhythm and another for the lung rhythm and (2) they become functionally coupled during metamorphosis. The present analysis, performed on neurograms recorded using brainstem preparations from Lithobates catesbeianus, aims to investigate the temporal organisation of lung and buccal burst types. Continuous Wavelet Transfom applied to the separated buccal and lung signals of a neurogram revealed that both buccal and lung frequency profiles exhibited the same low frequency peak around 1 Hz. This suggests that a common 'clock' organises both rhythms within an animal. A cross-correlation analysis applied to the buccal and lung burst signals revealed their similar intrinsic oscillation features, occurring at approximately 25 Hz. These observations suggest that a coupling between the lung and buccal oscillators emerges at metamorphosis. This coupling may be related to inter-connectivity between the two oscillators, and to a putative common drive.

中文翻译：

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Catesbeianus的颊和肺“呼吸”相关的颊运动是否有共同的动力？

在两栖动物中，有一些证据表明（1）解剖上独立的脑干呼吸振荡器参与了节律的产生，一个涉及颊节律，另一个涉及肺节律，（2）在变态过程中它们在功能上耦合。本分析是对使用Catesbeianus石蕊的脑干制剂记录的神经图进行的，旨在研究肺和颊突类型的时间结构。连续小波变换应用于神经图的分离的颊和肺信号显示，颊和肺的频率分布均在1 Hz附近显示相同的低频峰值。这表明一个共同的“时钟”在动物内组织了两个节律。应用于颊和肺突发信号的互相关分析显示了它们相似的固有振荡特征，发生在大约25 Hz。这些观察结果表明，在变态处出现了肺和颊腔振荡器之间的耦合。这种耦合可能与两个振荡器之间的互连性有关，并与一个假定的公共驱动器有关。