Heffner Rickye S, Koay Gimseong, Heffner Henry E
Department of Psychology, University of Toledo, MS #948, 2801 West Bancroft Street, Toledo, Ohio 43606, USA.
J Acoust Soc Am. 2010 Jun;127(6):3837-45. doi: 10.1121/1.3372717.
The authors determined the ability of two old-world non-echolocating bats, Eidolon helvum and Cynopterus brachyotis, to use binaural time and intensity difference cues for localization. The bats were trained to localize pure tones throughout most of their hearing range from loudspeakers located 30 degrees to the left and right of midline. Both species easily localized high frequency tones, indicating they could use the interaural intensity difference cue. However, neither was able to localize low frequency tones even when the tones were amplitude modulated thereby indicating that they could not use ongoing phase difference cues. The authors now know of eight mammals that do not use binaural phase cues for localization, and some possible reasons for this inability are explored.
作者们测定了两种旧大陆非回声定位蝙蝠——锤头果蝠和短耳犬蝠利用双耳时间和强度差异线索进行定位的能力。这些蝙蝠接受训练，要在其大部分听觉范围内，对位于中线左右30度的扬声器发出的纯音进行定位。这两个物种都能轻松定位高频音调，表明它们可以利用双耳强度差异线索。然而，即使对音调进行了幅度调制，它们也无法定位低频音调，这表明它们无法利用连续的相位差异线索。作者目前已知有八种哺乳动物不利用双耳相位线索进行定位，并探讨了导致这种无能的一些可能原因。
