Sound localization in a new-world frugivorous bat, Artibeus jamaicenis:: Acuity, use of binaural cues, and relationship to vision
Sound localization in a new-world frugivorous bat, Artibeus jamaicenis:: Acuity, use of binaural cues, and relationship to vision
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DOI：
10.1121/1.1329620
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发表时间：
2001-01-01
影响因子：
2.4
通讯作者：
Heffner, HE
中科院分区：
文献类型：
--
作者：
Heffner, RS;Koay, G;Heffner, HE
测定了回声定位的牙买加果蝠（Artibeus jamaicensis）的被动声定位敏锐度及其与视觉的关系。采用了一种条件回避程序，即动物在右侧有声音时从管口饮用果汁，但每当左侧有声音时就抑制其行为，与管口脱离接触，从而避免轻微电击。三只蝙蝠对100毫秒噪声脉冲的平均最小可听角度为10度——略优于埃及果蝠的11.6度阈值和大棕蝠的14度阈值。牙买加果蝠还能够定位低频和高频纯音，这表明它们能够利用双耳相位差和强度差线索进行定位。实际上，它们利用双耳相位线索的能力可延伸至6.3千赫兹，这是迄今为止哺乳动物中的最高频率。其最佳视野宽度（从解剖学上定义为神经节细胞密度至少为最大值75%的视网膜区域宽度）为34度。这个值与先前确定的视觉和听觉之间的关系相符，表明即使在回声定位的蝙蝠中，被动声定位的主要功能也是将眼睛导向声源。（C）2001美国声学学会。
Passive sound-localization acuity and its relationship to vision were determined fur the echolocating Jamaican fruit bat (Artibeus jamaicensis), A conditioned avoidance procedure was used in which the animals drank fruit juice from a spout in the presence of sounds from their right, but suppressed their behavior, breaking contact with the spout, whenever a sound came from their left, thereby avoiding a mild shock. The mean minimum audible angle for three bats for a 100-ms noise burst was 10 degrees -marginally superior to the 11.6 degrees threshold for Egyptian fruit bats and the 14 degrees threshold for big brown bats. Jamaican fruit bats were also able to localize both low- and high-frequency pure tones, indicating that they can use both binaural phase- and intensity-difference cues to locus. Indeed, their ability to use the binaural phase cue extends up to 6.3 kHz, the highest frequency so far for a mammal. The width of their field of best vision, defined anatomically as the width of the retinal area containing ganglion-cell densities at least 75% of maximum, is 34 degrees. This value is consistent with the previously established relationship between vision and hearing indicating that, even in echolocating bats, the primary function of passive sound localization is to direct the eyes to sound sources. (C) 2001 Acoustical Society of America.