栗鼠的声音定位。II. 前后定位和垂直定位。

Sound localization in chinchillas. II. Front/back and vertical localization.

作者信息

Heffner R S, Heffner H E, Koay G

机构信息

Department of Psychology, University of Toledo, OH 43606, USA.

出版信息

Hear Res. 1995 Aug;88(1-2):190-8. doi: 10.1016/0378-5955(95)00112-h.

DOI:10.1016/0378-5955(95)00112-h

PMID:8575995

Abstract

The ability of chinchillas to make front/back and vertical locus discriminations was examined behaviorally using a conditioned avoidance procedure. Their minimum audible angle for localizing single broadband noise bursts was 36 degrees for front/back localization and 23 degrees for vertical localization. Sound localization tests using filtered noise demonstrated that the signal must contain high frequencies in order for chinchillas to make front/back and vertical locus judgements and that frequencies in their highest audible octave (i.e., above 16 kHz) contribute to localization. These results support the view that a major selective advantage of high-frequency hearing in mammalian evolution was its utility for monaural as well as binaural sound localization.

摘要

利用条件性回避程序，对栗鼠进行前后和垂直位置辨别能力的行为学检测。它们对单个宽带噪声脉冲进行定位的最小可听角度，前后定位为36度，垂直定位为23度。使用滤波噪声进行的声音定位测试表明，信号必须包含高频成分，栗鼠才能进行前后和垂直位置判断，且其最高可听倍频程（即16千赫以上）的频率有助于定位。这些结果支持这样一种观点，即在哺乳动物进化过程中，高频听力的一个主要选择优势在于其对单耳和双耳声音定位均有用处。