Auditory temporal resolution in birds: Discrimination of harmonic complexes
Auditory temporal resolution in birds: Discrimination of harmonic complexes
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DOI：
10.1121/1.1494447
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发表时间：
2002-08-01
影响因子：
2.4
通讯作者：
Dent, ML
中科院分区：
文献类型：
--
作者：
Dooling, RJ;Leek, MR;Dent, ML
在行为实验中检查了三种鸟类区分基频从 50 到 1000 Hz 变化的选定谐波复合体的能力。刺激是合成谐波复合体，其波形形状通过分量相位选择而改变，保持光谱和强度信息恒定。鸟类能够区分具有随机选择的分量相位的波形和所有分量均为余弦相位的波形，以及谐波周期短至 1-2 ms 的正负施罗德相位波形。相比之下，人类听众无法在小于 3-4 毫秒的时间内做出这些辨别。电生理学测量，包括对行为测试中使用的相同刺激进行耳蜗微音和复合动作电位测量，显示鸟类和沙鼠之间的差异与鸟类和人类之间观察到的心理物理差异相似，但不能完全解释。从这些数据看来，鸟类可以在很短的时间内听到复杂波形中的精细时间结构。这些数据表明，与人类甚至其他哺乳动物相比，鸟类能够对复杂的声音进行更精确的时间分辨率。生理数据进一步表明，这种高时间分辨能力的至少部分机制存在于鸟类听觉系统的外围水平。 (C) 2002 年美国声学学会。
The ability of three species of birds to discriminate among selected harmonic complexes with fundamental frequencies varying from 50 to 1000 Hz was examined in behavioral experiments. The stimuli were synthetic harmonic complexes with waveform shapes altered by component phase selection, holding spectral and intensive information constant. Birds were able to discriminate between waveforms with randomly selected component phases and those with all components in cosine phase, as well as between positive and negative Schroeder-phase waveforms with harmonic periods as short as 1-2 ms. By contrast, human listeners are unable to make these discriminations at periods less than about 3-4 ms. Electrophysiological measures, including cochlear microphonic and compound action potential measurements to the same stimuli used in behavioral tests, showed differences between birds and gerbils paralleling, but not completely accounting for, the psychophysical differences observed between birds and humans. It appears from these data that birds can hear the fine temporal structure in complex waveforms over very short periods. These data show birds are capable of more precise temporal resolution for complex sounds than is observed in humans and perhaps other mammals. Physiological data further show that at least part of the mechanisms underlying this high temporal resolving power resides at the peripheral level of the avian auditory system. (C) 2002 Acoustical Society of America.