大棕蝠（棕蝠）的听力图。

Audiogram of the big brown bat (Eptesicus fuscus).

作者信息

Koay G, Heffner H E, Heffner R S

机构信息

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

出版信息

Hear Res. 1997 Mar;105(1-2):202-10. doi: 10.1016/s0378-5955(96)00208-0.

DOI:10.1016/s0378-5955(96)00208-0

PMID:9083817

Abstract

The audiograms of three big brown bats (Eptesicus fuscus) were determined using a conditioned avoidance procedure. The average audiogram ranged from 0.850 kHz at 106 dB to 120 kHz at 83 dB SPL, with a best threshold of 7 dB at 20 kHz and a distinct decrease in sensitivity at 45 kHz. The results confirm those of a previous study by Dalland (1965a) that the big brown bat has good high-frequency hearing coupled with poor low-frequency hearing. Comparative analysis suggests that the bat's good high-frequency hearing initially evolved for passive sound localization and that it was later coopted for use in echolocation. In addition, the restricted low-frequency hearing of the big brown bat is typical of mammals with good high-frequency hearing.

摘要

使用条件性回避程序测定了三只大棕蝠（棕蝠）的听力图。平均听力图范围为106分贝时的0.850千赫兹至83分贝声压级时的120千赫兹，20千赫兹时的最佳阈值为7分贝，45千赫兹时灵敏度明显下降。结果证实了达兰德（1965a）先前的一项研究结果，即大棕蝠具有良好的高频听力，但低频听力较差。比较分析表明，蝙蝠良好的高频听力最初是为被动声音定位而进化的，后来被用于回声定位。此外，大棕蝠有限的低频听力是具有良好高频听力的哺乳动物的典型特征。