Comparison of properties of cortical echo delay-tuning in the short-tailed fruit bat and the mustached bat
Comparison of properties of cortical echo delay-tuning in the short-tailed fruit bat and the mustached bat
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DOI：
10.1007/s00359-010-0530-8
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发表时间：
2011-05-01
影响因子：
2.1
通讯作者：
Koessl, Manfred
中科院分区：
文献类型：
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作者：
Hagemann, Cornelia;Vater, Marianne;Koessl, Manfred
对回声延迟敏感的皮层神经元计算目标距离是食虫蝙蝠听觉系统的一个重要特征。为了评估诸如检测小昆虫与植物较大固定表面之类的功能需求是否反映在皮质特性中，我们比较了属于Noctilionoidea超科中相关科的果食性（C. perspicillata， CP）和食性（P. parnellii， PP）蝙蝠物种的延迟调谐神经元。延迟调谐曲线的带宽和形状以及特征延迟的范围在两个物种中是相似的，因此与不同的回声定位策略无关。大多数单元响应2-6 ms的回波延迟，最敏感的阈值为20-30 dB SPL。在CP中，调谐到延迟bb0 - 12ms的单元比PP中略丰富，也更敏感。CP中所有延迟调谐的神经元都对单一纯音刺激有可靠的反应，而PP中只有49%的延迟调谐单元观察到这种反应。CP中回声延迟的皮层表征（时变性）覆盖了更大的区域，但不像PP中描述的那样精确。如果这些地形上的差异与回声定位行为有关，这是开放的。
Target-distance computation by cortical neurons sensitive to echo delay is an essential characteristic of the auditory system of insectivorous bats. To assess if functional requirements such as detection of small insects versus larger stationary surfaces of plants are reflected in cortical properties, we compare delay-tuned neurons in a frugivorous (C. perspicillata, CP) and an insectivorous (P. parnellii, PP) bat species that belong to related families within the superfamily of Noctilionoidea. The bandwidth and shape of delay-tuning curves and the range of characteristic delays are similar in both species and hence are not related to different echolocation strategies. Most units respond at 2-6 ms echo delay with most sensitive thresholds of 20-30 dB SPL. In CP, units tuned to delays > 12 ms are slightly more abundant and are more sensitive than in PP. All delay-tuned neurons in CP reliably respond to single pure-tone stimuli, whereas such responses are only observed in 49% of delay-tuned units in PP. The cortical representation of echo delay (chronotopy) covers a larger area in CP but is less precise than described in PP. Since chronotopy is absent in certain other insectivorous bat species, it is open if these differences in topography are related to echolocation behaviour.