Bat echolocation processing using first-spike latency coding
Bat echolocation processing using first-spike latency coding
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DOI：
10.1016/j.neunet.2009.05.002
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发表时间：
2009-12-01
期刊：
影响因子：
7.8
通讯作者：
Peremans, Herbert
中科院分区：
文献类型：
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作者：
Fontaine, Bertrand;Peremans, Herbert
为了进行回声定位，所谓的调频蝙蝠会发射持续时间为几毫秒的短脉冲，并分析从它们的环境中产生的回声。一个单独的回声，由于其持续时间较短，将导致早期听觉系统中的神经元只产生1到3个棘波。因此，我们认为对于调频蝙蝠来说，使用尖峰时间而不是射速信息是有利的。我们提出了一个简单的单耳和双耳通路到中脑的尖峰时间模型，以表明尖峰时间信息确实可以被已知的神经结构处理。特别是，我们发现，由听神经提供的第一峰潜伏期(FSL)码可以代表外周系统中与头部相关的传递函数所诱导的单耳和双耳强度提示。我们还表明，上升中心增强了这样的FSL代码所传达的线索。最后，我们给出了实验结果，将本文提出的基于FSL代码的模型与更经典的激发速率代码进行了比较，我们表明第一尖峰延迟是一种更具生物学合理性的替代方案。(C)2009爱思唯尔有限公司。保留所有权利。
To perform echolocation, so-called FM-bats emit short pulses i.e., with a duration of a few milliseconds, and analyse the echoes coining from their environment. One individual echo, due to its short duration, will cause neurons in the early auditory system to generate between 1 and 3 spikes only. Hence, we argue that it is advantageous for FM-bats to use spike-time rather that firing rate information. We present a simple spike-time model of the monaural and binaural pathways up to the midbrain, to show that spike-time information can indeed be processed by the known neural architecture. In particular, we show that a First Spike Latency (FSL) code, as provided by the auditory nerves, can represent both the monaural and binaural intensity cues induced by the head-related transfer function in the peripheral system. We also show that ascending centres enhance the cues conveyed by such an FSL code. Finally, we present experimental results, comparing the FSL code based model proposed here with a more classic firing rate code, and we show that first-spike latency is a more biologically plausible alternative. (C) 2009 Elsevier Ltd. All rights reserved.