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首页> 外文期刊>Journal of the Association for Research in Otolaryngology: JARO >Auditory forebrain neurons track temporal features of time-warped natural stimuli
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Auditory forebrain neurons track temporal features of time-warped natural stimuli

机译：听觉前脑神经元跟踪时间扭曲的自然刺激的时间特征

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摘要

A fundamental challenge for sensory systems is to recognize natural stimuli despite stimulus variations. A compelling example occurs in speech, where the auditory system can recognize words spoken at a wide range of speeds. To date, there have been more computational models for time-warp invariance than experimental studies that investigate responses to time-warped stimuli at the neural level. Here, we address this problem in the model system of zebra finches anesthetized with urethane. In behavioral experiments, we found high discrimination accuracy well beyond the observed natural range of song variations. We artificially sped up or slowed down songs (preserving pitch) and recorded auditory responses from neurons in field L, the avian primary auditory cortex homolog. We found that field L neurons responded robustly to time-warped songs, tracking the temporal features of the stimuli over a broad range of warp factors. Time-warp invariance was not observed per se, but there was sufficient information in the neural responses to reliably classify which of two songs was presented. Furthermore, the average spike rate was close to constant over the range of time warps, contrary to recent modeling predictions. We discuss how this response pattern is surprising given current computational models of time-warp invariance and how such a response could be decoded downstream to achieve time-warp-invariant recognition of sounds.
机译：感觉系统的基本挑战是，尽管刺激变化，也要识别自然刺激。一个令人信服的例子出现在语音中，其中听觉系统可以识别各种速度的语音。迄今为止，与在神经水平上研究对时间扭曲刺激的响应的实验研究相比，时间扭曲不变性的计算模型更多。在这里，我们在用氨基甲酸乙酯麻醉的斑马雀的模型系统中解决了这个问题。在行为实验中，我们发现高判别精度远远超出了观察到的歌曲变化的自然范围。我们人为地加快或减慢了歌曲的速度（保持音调），并记录了来自田野L（禽类初级听觉皮层同源物）中神经元的听觉反应。我们发现，场L神经元对时间扭曲的歌曲有很强的反应，在广泛的扭曲因素上跟踪了刺激的时间特征。本身没有观察到时间扭曲不变性，但是神经反应中有足够的信息可以可靠地对呈现的两首歌曲进行分类。此外，与最近的模型预测相反，平均尖峰速率在时间扭曲范围内接近恒定。我们讨论了给定当前时间扭曲不变的计算模型时，这种响应模式如何令人惊讶，以及如何将这种响应解码到下游以实现声音的时间扭曲不变的识别。

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