Acoustic feature extraction by cross-correlation in crickets?
Acoustic feature extraction by cross-correlation in crickets?
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DOI：
10.1007/s00359-003-0438-7
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发表时间：
2003-08-01
影响因子：
2.1
通讯作者：
Hennig, RM
中科院分区：
文献类型：
--
作者：
Hennig, RM
脊椎动物和昆虫听觉通路中声学特征提取的常见概念假设时间滤波器调整为特定的周期性。蟋蟀选择性地响应同种歌曲模式并揭示带通特征，该特征被认为是由有限范围内的周期内的匹配滤波器产生的。出乎意料的是，Teleogryllus oceanicus 和 T. commodus 这两个同胞物种的雌性在基本过滤特性方面存在差异。 T. oceanicus 表现出周期滤波器，而 T. commodus 则表现出脉冲持续时间滤波器。这一发现提出了一个问题：用于模式分析的同源神经元回路的如此独特的特性是如何在物种形成过程中进化的。有证据表明，通过互相关进行的信号分析为模式选择性的差异以及进化转变提供了简单的解释。通过互相关，可以在特定时间窗口内确定外部模式与内部模板的相似性。行为数据和互相关值的比较表明这两个物种具有相似的模板。然而，物种之间的时间窗存在显着差异（T. oceanicus：180-400 ms，T. commodus：90-160 ms）。因此，仅需要改变评估时间窗口来解释观察到的特征提取差异，以维持物种隔离。
Common concepts of acoustic feature extraction within the auditory pathway of vertebrates and insects assume temporal filters tuned to particular periodicities. Crickets respond selectively to the conspecific song pattern and reveal a bandpass characteristic, which is thought to arise from a matched filter for a restricted range of periods. Unexpectedly, females of the two sibling species Teleogryllus oceanicus and T. commodus differed in fundamental filter properties. While T. oceanicus revealed a period filter, T. commodus exhibited a pulse duration filter. This finding raises the question of how so distinct properties of homologous neuronal circuits for pattern analysis have evolved during speciation. Evidence is presented that signal analysis by cross-correlation offers a simple explanation for differences in pattern selectivity as well as for the evolutionary transition. By cross-correlation the similarity of an external pattern with an internal template is determined over a certain time window. A comparison of behavioural data and cross-correlation values suggested that both species have similar templates. However, time windows were significantly different between species (T. oceanicus: 180-400 ms, T. commodus: 90-160 ms). Consequently, solely a change in the evaluation time window is required to account for the observed differences in feature extraction that serve to maintain species isolation.