Markovitz N S, Pollak G D
Department of Zoology, University of Texas, Austin 78712.
Hear Res. 1993 Dec;71(1-2):51-63. doi: 10.1016/0378-5955(93)90020-2.
Neurons in the mustache bat dorsal nucleus of the lateral lemniscus (DNLL) were examined in response to monaural stimulation. There are six main findings of this study. First, the mustache bat DNLL is tonotopically organized. Second, EI cells are the predominant aural type and comprise about 80% of DNLL neurons, whereas monaural and EE cells are far less numerous. Third, the majority of DNLL neurons have either monotonic or weakly nonmonotonic rate-intensity functions. Fourth, a chopping pattern is evoked by contralateral stimulation in 58% of DNLL neurons and is the predominant temporal response pattern. Fifth, neurons with different aural properties tend to exhibit different temporal response patterns: EI cells are largely choppers, while EO and EE cells are more often primarylike or primarylike-with-notch. Sixth, the sustained responses of EE units to contralateral stimulation differs dramatically from their onset responses to ipsilateral stimulation. Here we have demonstrated that although a large proportion of mustache bat DNLL neurons are EI choppers, the DNLL nonetheless contains a heterogeneous population of neurons based on physiological responses to pure tones.
研究人员检测了髯蝠外侧丘系背核（DNLL）中的神经元对单耳刺激的反应。本研究有六个主要发现。第一，髯蝠的DNLL呈音频拓扑组织。第二，EI细胞是主要的听觉类型，约占DNLL神经元的80%，而单耳细胞和EE细胞的数量则少得多。第三，大多数DNLL神经元具有单调或弱非单调的放电率-强度函数。第四，58%的DNLL神经元在对侧刺激下会诱发一种斩波模式，这是主要的时间反应模式。第五，具有不同听觉特性的神经元往往表现出不同的时间反应模式：EI细胞主要是斩波型，而EO和EE细胞更常表现为初级样或带凹口的初级样。第六，EE单元对侧刺激的持续反应与其对同侧刺激的起始反应有显著差异。我们在此证明，尽管很大一部分髯蝠DNLL神经元是EI斩波型，但基于对纯音的生理反应，DNLL仍然包含异质性的神经元群体。
