Two measures of temporal resolution in brown-headed cowbirds (Molothrus ater)
Two measures of temporal resolution in brown-headed cowbirds (Molothrus ater)
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DOI：
10.1007/s00359-011-0687-9
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发表时间：
2012-01-01
影响因子：
2.1
通讯作者：
Lucas, Jeffrey R.
中科院分区：
文献类型：
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作者：
Gall, Megan D.;Henry, Kenneth S.;Lucas, Jeffrey R.
鸟类听觉时间分辨率的研究传统上通过评估时间结构不同的声音的行为辨别来检查处理能力。在这里，时间分辨率的棕头燕八哥（Molothrus ater）的测量使用两个听觉诱发电位（AEP）为基础的方法：听觉脑干反应（ABR）成对点击和包络以下的反应（EFR）调幅音。燕八哥观察到的基本模式与其他鸣禽物种相似，表明它们具有相似的时间处理能力。ABR的振幅的第二次点击小于第一次点击在inter-click间隔小于10 ms，并减少到30%，在间隔为1 ms。EFR振幅一般是最大的调制频率从335到635 Hz，并在更高和更低的调制频率下降。从陆地哺乳动物的数据相比，这些结果支持最近的行为研究结果，增强鸟类的时间分辨率。这些AEP结果和基于行为的研究之间的一般协议表明，AEP可以提供一个有用的评估野生鸟类物种的时间分辨率。
Studies of auditory temporal resolution in birds have traditionally examined processing capabilities by assessing behavioral discrimination of sounds varying in temporal structure. Here, temporal resolution of the brown-headed cowbird (Molothrus ater) was measured using two auditory evoked potential (AEP)-based methods: auditory brainstem responses (ABRs) to paired clicks and envelope following responses (EFRs) to amplitude-modulated tones. The basic patterns observed in cowbirds were similar to those found in other songbird species, suggesting similar temporal processing capabilities. The amplitude of the ABR to the second click was less than that of the first click at inter-click intervals less than 10 ms, and decreased to 30% at an interval of 1 ms. EFR amplitude was generally greatest at modulation frequencies from 335 to 635 Hz and decreased at higher and lower modulation frequencies. Compared to data from terrestrial mammals these results support recent behavioral findings of enhanced temporal resolution in birds. General agreement between these AEP results and behaviorally based studies suggests that AEPs can provide a useful assessment of temporal resolution in wild bird species.