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首页> 外文期刊>Journal of Neurophysiology >Delay-tuned neurons in the midbrain of the big brown bat.
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Delay-tuned neurons in the midbrain of the big brown bat.

机译：大棕蝙蝠中脑的延迟调谐神经元。

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1. The auditory midbrain in Eptesicus contains delay-tuned neurons that encode target range. Most delay-tuned neurons respond poorly to tones or individual frequency-modulated (FM) sweeps and require combinations of FM sweeps. They are combination sensitive and delay tuned. The index of facilitation (IF), a coefficient measuring combination sensitivity for individual delay-tuned neurons, ranged from 0.14 to 1.0, with an average of 0.64 +/- 0.24 (mean +/- SD). Of the 33 facilitated responses from 29 neurons, 23 (70%) exhibited IFs > 0.5, which corresponds to a facilitated response 3 times greater than the sum of the responses to individual pulse and echoes. Thus the responses of midbrain delay-tuned neurons are highly combination sensitive. 2. The response of midbrain delay-tuned neurons is phasic, with an average of 0.7 +/- 0.4 action potentials elicited per optimal pulse-echo pair. Thus midbrain delay-tuned neurons in Eptesicus act as probability encoders. 3. The distribution of best echo delays (BDs)of midbrain delay-tuned neurons ranged from 8 to 30 ms. As an ensemble, midbrain delay-tuned neurons encode target ranges of 138-516 cm. There is a basic correspondence between the physiologically determined span of midbrain BDs between 8 and 30 ms and the behaviorally determined borders of the approach (8- to 17-ms echo delay) and search stages (17- to 30-ms echo delay) of the insect pursuit sequence. Midbrain delay-tuned neurons can be separated into two subpopulations on the basis of the difference in distributions of the echo best amplitude (EBA) tuning at BD. The BDs of one subpopulation correspond to the span of search stage echo delays, and the BDs of the other subpopulation correspond to the span of approach stage echo delays. 4. EBAs of neurons in each subpopulation are tailored to the specific perceptual requirements of the corresponding behavioral stage. EBAs of midbrain neurons tuned to echo delays between 17 and 30 ms (N = 12) correspond to the search stage and are suited to the requirements of target detection. EBAs of midbrain neurons tuned to echo delays between 17 and 30 ms (N = 21) correspond to the approach stage and are suited to the requirements of target size discrimination. 5. The best FM sweeps for the pulse (PFM) and echo (EFM) were determined for each midbrain neuron. PFMs appear to cluster at frequencies corresponding to the three harmonic peaks in the emitted pulse power spectra.(ABSTRACT TRUNCATED AT 400 WORDS)
机译：1.腓肠肌的听觉中脑含有编码目标范围的延迟调谐神经元。大多数延迟调谐的神经元对音调或单独的调频（FM）扫描反应较差，需要组合FM扫描。它们是组合敏感的，并且延迟调整。促进指数（IF）是衡量各个延迟调谐神经元的组合敏感性的系数，范围为0.14至1.0，平均值为0.64 +/- 0.24（平均值+/- SD）。来自29个神经元的33个促进反应中，有23个（70％）的IF> 0.5，这对应于对单个脉冲和回声的反应总和的3倍。因此，中脑延迟调谐神经元的反应是高度组合敏感的。 2.中脑延迟调谐神经元的反应是阶段性的，每个最佳脉冲回声对平均产生0.7 +/- 0.4个动作电位。因此，Eptesicus中脑延迟调谐神经元充当概率编码器。 3.中脑延迟调谐神经元的最佳回声延迟（BDs）分布范围为8到30 ms。作为合奏，中脑延迟调谐神经元编码的目标范围为138-516 cm。在生理上确定的8到30毫秒之间的中脑BD跨度与行为确定的进场边界（8到17毫秒回声延迟）和搜索阶段（17到30毫秒回声延迟）之间存在基本的对应关系。昆虫追击顺序。中脑延迟调谐神经元可以根据BD的回声最佳振幅（EBA）调谐分布的差异分为两个亚群。一个子种群的BD对应于搜索阶段回声延迟的跨度，另一子种群的BD对应于接近阶段回声延迟的跨度。 4.每个亚群中神经元的EBA均根据相应行为阶段的特定感知要求量身定制。调整到17到30毫秒（N = 12）之间的回声延迟的中脑神经元EBA对应于搜索阶段，适合于目标检测的要求。中脑神经元的EBA调整为在17到30毫秒（N = 21）之间的回声延迟，对应着接近阶段，适合于目标大小区分的要求。 5.确定每个中脑神经元的脉冲（PFM）和回声（EFM）的最佳FM扫描。 PFM似乎聚集在与所发射脉冲功率谱中的三个谐波峰值相对应的频率处（抽象截断为400字）

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