Heffner R, Heffner H
Science. 1980 May 2;208(4443):518-20. doi: 10.1126/science.7367876.
Auditory thresholds were determined for a 7-year-old Indian elephant. The hearing range extended from 17 hertz to 10.5 kilohertz. The results indicate that the inverse relationship between functional interaural distance (that is, the distance between the two ears divided by the speed of sound) and high-frequency hearing limit is valid even for very large mammals.
测定了一头7岁印度象的听觉阈值。其听力范围从17赫兹延伸至10.5千赫兹。结果表明，功能耳间距离（即两耳之间的距离除以声速）与高频听力极限之间的反比关系即使对于非常大型的哺乳动物也是成立的。
