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Efficient auditory coding.

机译:高效的听觉编码。

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摘要

The auditory neural code must serve a wide range of auditory tasks that require great sensitivity in time and frequency and be effective over the diverse array of sounds present in natural acoustic environments. It has been suggested that sensory systems might have evolved highly efficient coding strategies to maximize the information conveyed to the brain while minimizing the required energy and neural resources. Here we show that, for natural sounds, the complete acoustic waveform can be represented efficiently with a nonlinear model based on a population spike code. In this model, idealized spikes encode the precise temporal positions and magnitudes of underlying acoustic features. We find that when the features are optimized for coding either natural sounds or speech, they show striking similarities to time-domain cochlear filter estimates, have a frequency-bandwidth dependence similar to that of auditory nerve fibres, and yield significantly greater coding efficiency than conventional signal representations. These results indicate that the auditory code might approach an information theoretic optimum and that the acoustic structure of speech might be adapted to the coding capacity of the mammalian auditory system.
机译:听觉神经代码必须服务于各种各样的听觉任务,这些听觉任务需要时间和频率上的高度敏感性,并且对自然声学环境中存在的各种声音有效。已经提出,感觉系统可能已经发展出高效的编码策略,以使传递到大脑的信息最大化,同时使所需的能量和神经资源最小化。在这里,我们表明,对于自然声音,可以使用基于种群尖峰代码的非线性模型有效地表示完整的声波波形。在此模型中,理想化的尖峰会编码基本声学特征的精确时间位置和大小。我们发现,当这些功能被优化用于编码自然声音或语音时,它们显示出与时域耳蜗滤波器估计值惊人的相似性,具有类似于听觉神经纤维的频率带宽依赖性,并且产生的编码效率明显高于传统的听觉神经纤维。信号表示。这些结果表明听觉代码可能接近信息理论的最佳值,并且语音的声音结构可能适合于哺乳动物听觉系统的编码能力。

著录项

  • 来源
    《Nature》 |2006年第7079期|P.978-982|共5页
  • 作者

    Smith EC; Lewicki MS;

  • 作者单位

    Department of Psychology, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 基础医学;
  • 关键词

    neural; Efficient; With frequency; Speech; Models; 言语;

    机译:神经;有效;有频率;语音;模型;言语;

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