Jamming avoidance response of big brown bats in target detection
Jamming avoidance response of big brown bats in target detection
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DOI：
10.1242/jeb.009688
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发表时间：
2008-01-01
影响因子：
2.8
通讯作者：
Simmons, James A.
中科院分区：
文献类型：
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作者：
Bates, Mary E.;Stamper, Sarah A.;Simmons, James A.
当寻找猎物时，大棕蝠（Eptesicus fuscus）通过将更多的能量集中在调频扫描的近恒频（CF）尾部来扩大声纳的范围。我们假设，这部分信号可能容易受到干扰，从同种使用相同的频率在自己的发射。为了确定蝙蝠在遇到干扰刺激时如何修改它们的信号，我们比较了CF干扰音打开和关闭时蝙蝠的回声定位呼叫。这些蝙蝠在实验室里进行了一项需要使用回声定位的两种选择的强制选择检测任务。只有当干扰频率在蝙蝠的优选基线频率的2-3 kHz内时，所有三只蝙蝠才将其发射频率的尾端CF分量双向地从CF干扰刺激物移开。在干扰和无干扰试验之间，它们的发射持续时间没有区别。蝙蝠的干扰回避反应可能有助于避免在对目标探测很重要的窄频率范围内的掩蔽或干扰。
When searching for prey, big brown bats (Eptesicus fuscus) enhance the range of their sonar by concentrating more energy in the nearly constant-frequency (CF) tail portion of their frequency-modulated ( FM) sweeps. We hypothesize that this portion of their signals may be vulnerable to interference from conspecifics using the same frequencies in their own emissions. To determine how bats modify their signals when confronted with an interfering stimulus, we compared the echolocation calls of bats when a CF jamming tone was on and off. The bats performed a two-alternative forced-choice detection task in the laboratory that required the use of echolocation. All three bats shifted the tail-end CF component of their emitted frequency bidirectionally away from the CF jamming stimulus only when the jamming frequency was within 2-3 kHz of the preferred baseline frequency of the bat. The duration of their emissions did not differ between the jamming and no-jamming trials. The jamming avoidance response of bats may serve to avoid masking or interference in a narrow range of frequencies important for target detection.