Intensity control during target approach in echolocating bats; stereotypical sensori-motor behaviour in Daubenton's bats, Myotis daubentonii.
Intensity control during target approach in echolocating bats; stereotypical sensori-motor behaviour in Daubenton's bats, Myotis daubentonii.
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发表时间：
2002-09
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通讯作者：
A. Boonman;Gareth J. F. Jones
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作者：
A. Boonman;Gareth J. F. Jones
当接近猎物目标时，蝙蝠会降低其发出的回声定位脉冲的强度，称为强度补偿。在本文中，我们研究的强度补偿蝙蝠回声定位是灵活的或刻板的。我们记录的回声定位呼叫的Daureton的蝙蝠（鼠耳蝠daureonii），而动物攻击的目标不同的尺寸。鼠耳蝠daughonii减少了约4dB的距离，每减半发出的峰值声压级，无论提出的目标（mealworms和两个不同大小的球体）。蝙蝠发出的绝对声压级不受或仅受目标强度的影响很小。此外，发射强度随距离的减小示出了在最后20 cm的目标接近中随时间的相同强度的散射更少。蝙蝠匹配发射强度的目标距离同样好的球体（方面不变的目标强度）为mealworms（方面相关的回声强度）。因此，我们得出结论，强度补偿不依赖于从接收到的强度的反馈信息，而是遵循一个刻板的模式。
When approaching a prey target, bats have been found to decrease the intensity of their emitted echolocation pulses, called intensity compensation. In this paper we examine whether intensity compensation in the echolocation of bats is flexible or stereotyped. We recorded the echolocation calls of Daubenton's bats (Myotis daubentonii) while the animals attacked targets of different dimensions. Myotis daubentonii reduced the peak sound pressure level emitted by about 4dB for each halving of distance, irrespective of the target presented (mealworms and two different sizes of spheres). The absolute sound pressure level emitted by the bat is not or only a little affected by target strength. Furthermore, the decrease in emitted intensity over distance shows less scatter than the same intensity over time for the last 20 cm of target approach. The bats matched the emitted intensity to target distance equally well for the spheres (aspect-invariant target strength) as for the mealworms (aspect-dependent echo strength). We therefore conclude that intensity compensation does not rely on feedback information from received intensity, but instead follows a stereotyped pattern.