No neural evidence for dynamic auditory tuning of the A1 receptor in the ear of the noctuid moth, Noctua pronuba.
No neural evidence for dynamic auditory tuning of the A1 receptor in the ear of the noctuid moth, Noctua pronuba.
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没有神经证据表明夜蛾 (Noctua pronuba) 耳朵中 A1 受体的动态听觉调节。
DOI：
10.1007/s00359-009-0471-2
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Dawson,JeffW
中科院分区：
文献类型：
--
作者：
Asi,NavdeepS;Fullard,JamesHoward;Whitehead,Scott;Dawson,JeffW
通过研究夜蛾（Noctua pronuba）鼓膜的机械特性，Windmill等人（2006年）提出，当暴露于高强度声音（HIS）时，这种昆虫会增加（上调）其最佳听力的频率，类似于攻击蝙蝠的回声定位呼叫。我们测试了这种生物物理现象是否编码在暴露于HIS之前和之后的这种蛾的最敏感的听觉受体（A1细胞）的神经反应中。我们测量了：（1）每个刺激脉冲的A1动作电位（尖峰）的数量;（2）低于确定引起逃避飞行动作的A1尖峰周期的比例;（3）在与向上调整持续的时间类似的持续时间内A1细胞放电（尖峰数量、尖峰间期、刺激/尖峰潜伏期）的变化。在暴露于HIS后，我们观察到在预测方向上对任何测试频率的尖峰响应没有显著变化，并且我们仅观察到A1放电的24个预测时间依赖性变化中的两个。这些结果表明，鼓膜向上调谐不会导致这个蛾的听觉频率敏感性的变化，我们建议要么感觉共振或增加胸肌张力暴露后HIS作为替代解释。
By examining the mechanical properties of the tympanum of the noctuid moth,Noctua pronuba, Windmill et al. (2006) suggested that this insect increases (up-tunes) the frequencies of its best hearing when exposed to high intensity sounds (HIS) resembling the echolocation calls of attacking bats. We tested whether this biophysical phenomenon was encoded in the neural responses of this moth’s most sensitive auditory receptor (A1 cell) before and after exposure to HIS. We measured: (1) the number of A1 action potentials (spikes) per stimulus pulse; (2) the proportion of A1 spike periods below that determined to elicit evasive flight maneuvers and, (3) the change in A1 cell firing (spike number, interspike interval, stimulus/spike latency) over a duration of time similar to that in which up-tuning lasts. We observed no significant spiking response changes in the predicted direction to any of the frequencies tested following exposure to HIS and we observed only two of the 24 predicted time-dependent changes to A1 firing. These results indicate that tympanal up-tuning does not result in a change to this moth’s auditory frequency sensitivity and we suggest either sensillar resonances or increases in thoracic muscle tension following exposure to HIS as alternative explanations.
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