Processing pitch in a nonhuman mammal (Chinchilla laniger).
Processing pitch in a nonhuman mammal (Chinchilla laniger).
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非人类哺乳动物（龙猫）处理沥青。
DOI：
10.1037/a0029734
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Chaney,Megan
中科院分区：
文献类型：
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作者：
Shofner,WilliamP;Chaney,Megan
产生音调的机制是否反映了光谱或时间过程，长期以来一直存在争议。一般来说，频谱中具有强谐结构的声音在其时间结构中具有很强的周期性。我们发现，当宽带谐音复合体通过噪声声码器时，所产生的声音可以具有具有较大峰谷比的谐波结构，但在时间结构上几乎没有周期性。为了测试谐音结构在非人类哺乳动物音调知觉中的作用，我们使用刺激泛化范式测量了龙猫(Chinchilla Laniger)对噪声声码音调复合体的行为反应。龙舌兰辨别出和声音调复合体或来自1声道声码版本的音调复合体的迭代涟漪噪声。当用8、16、32、和128声道生成的声码版本进行测试时，响应与1声道版本的响应相似。行为反应不能用谐峰谷比作为声学提示，而可以用自相关函数的时间特性来解释，如周期性强度或第一峰的高度。这些结果表明，非人类哺乳动物的音高知觉不是通过频谱处理而是通过时间处理产生的。非人类哺乳动物的频谱处理对音调的影响很小，这一结论可能反映了比人类所描述的更广泛的耳蜗调优。(《心理信息数据库记录(C)2016 APA》，版权所有)
Whether the mechanisms giving rise to pitch reflect spectral or temporal processing has long been debated. Generally, sounds having strong harmonic structures in their spectra have strong periodicities in their temporal structures. We found that when a wideband harmonic tone complex is passed through a noise vocoder, the resulting sound can have a harmonic structure with a large peak-to-valley ratio, but with little or no periodicity in the temporal structure. To test the role of harmonic structure in pitch perception for a nonhuman mammal, we measured behavioral responses to noise-vocoded tone complexes in chinchillas (Chinchilla laniger) using a stimulus generalization paradigm. Chinchillas discriminated either a harmonic tone complex or an iterated rippled noise from a 1-channel vocoded version of the tone complex. When tested with vocoded versions generated with 8, 16, 32, 64, and 128 channels, responses were similar to those of the 1-channel version. Behavioral responses could not be accounted for based on harmonic peak-to-valley ratio as the acoustic cue, but could be accounted for based on temporal properties of the autocorrelation functions such as periodicity strength or the height of the first peak. The results suggest that pitch perception does not arise through spectral processing in nonhuman mammals but rather through temporal processing. The conclusion that spectral processing contributes little to pitch in nonhuman mammals may reflect broader cochlear tuning than that described in humans.(PsycINFO Database Record (c) 2016 APA, all rights reserved)