Frequency tuning and latency organization of responses in the inferior colliculus of Japanese house bat, Pipistrellus abramus
Frequency tuning and latency organization of responses in the inferior colliculus of Japanese house bat, Pipistrellus abramus
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DOI：
10.1121/1.3419904
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发表时间：
2010-09-01
影响因子：
2.4
通讯作者：
Riquimaroux, Hiroshi
中科院分区：
文献类型：
--
作者：
Goto, Kazuhiro;Hiryu, Shizuko;Riquimaroux, Hiroshi
Pipistrellus abramus 在搜索期间发出准恒定频率脉冲，这扩展了向下调频扫描的结束频率部分（终端频率；TF）。如果缩小的频率范围对于检测昆虫扑动引起的小频率变化很重要，那么蝙蝠可能需要更精细的 TF 频率分辨率。为了检验这一假设，通过电生理学方法测量了下丘 (IC) 中最佳频率 (BF) 的分布。回声定位脉冲的 TF 为 41.44 +/- 2.62 kHz。 35-45 kHz 的频率范围在 IC 中被过度呈现（n=50/105；48%），并且在 BF 分布中在 75-85 kHz（TF 的二次谐波）处看到微弱的第二个峰值。 BF 随背腹轴记录深度的变化而增加，但 35-45 和 75-85 kHz 的 BF 除外，它们在很宽的深度范围内被发现。对于 35-45 kHz 的 BF，响应延迟范围为 3.7 至 23.2 ms，从 IC 中观察到的延迟线估计最大目标范围为 3.3 m。这些电生理测量表明目标距离在大约 3 m 以内的重要性，这与该物种觅食期间的行为测量一致。 (c) 2010 年美国声学学会。 [DOI：10.1121/1.3419904]
Pipistrellus abramus emits quasi-constant frequency pulses during search, which extend the end frequency portion of the downward frequency-modulated sweep (terminal frequency; TF). If the narrowed frequency range is important for detecting a small frequency change caused by insect fluttering, the bats may need much finer frequency resolution at the TF. To test this hypothesis, the distribution of the best frequencies (BFs) in the inferior colliculus (IC) was electrophysiologically measured. The TF of the echolocation pulse was 41.44 +/- 2.62 kHz. The frequency range of 35-45 kHz was overrepresented in the IC (n=50/105; 48%), and a faint second peak was seen at 75-85 kHz (the second harmonic of the TF) in the BF distribution. The BF increased as a function of recording depth along the dorsoventral axis, except for the BFs of 35-45 and 75-85 kHz, which were found at a wide range of depths. The response latency ranged between 3.7 and 23.2 ms for the BFs of 35-45 kHz, and the maximum target range was estimated to be 3.3 m from the delay line observed in the IC. These electrophysiological measures suggest the importance of a target distance within approximately 3 m, which is consistent with behavioral measures during foraging in this species. (c) 2010 Acoustical Society of America. [DOI: 10.1121/1.3419904]