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首页> 外文期刊>The European Journal of Neuroscience >A two-path model of auditory modulation detection using temporal fine structure and envelope cues
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A two-path model of auditory modulation detection using temporal fine structure and envelope cues

机译：使用时间细结构和包络线本的听觉调制检测的两道路径模型

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A model using temporal-envelope cues was previously developed to explain perceptual interference effects between amplitude modulation and frequency modulation (FM). As that model could not accurately predict FM sensitivity and the interference effects, temporal fine structure (TFS) cues were added to the model. Thus, following the initial stage of the model consisting of a linear filter bank simulating cochlear filtering, processing was split into an 'envelope path' based on envelope power cues and a 'TFS path' based on a measure of the distribution of time intervals between successive zero-crossings. This yielded independent detectability indices for envelope and TFS cues, which were optimally combined to produce a single decision statistic. Independent internal noises in the envelope and TFS paths were adjusted to match the data. Simulations indicate that TFS cues are required to account for FM data for young normal-hearing listeners and that TFS processing is impaired for both older normal-hearing and hearing-impaired listeners. The role of TFS was further assessed by relating the monaural FM sensitivity to measures of interaural phase difference, commonly assumed to rely on binaural TFS sensitivity. The model demonstrates that binaural TFS sensitivity is considerably lower than monaural TFS sensitivity. Similar to FM thresholds, interaural phase difference sensitivity declined with age and hearing loss, although higher degradations were observed in binaural temporal processing compared to monaural processing. Overall, this model provides a novel tool to explore the mechanisms involved in FM processing in the normal auditory system and the degradations in FM sensitivity with ageing and hearing loss.
机译：先前已经开发了一个使用时间包络线索的模型来解释振幅调制和频率调制（FM）之间的知觉干扰效应。由于该模型不能准确预测FM敏感性和干扰效应，因此在模型中加入了时间精细结构（TFS）线索。因此，在由模拟耳蜗滤波的线性滤波器组组成的模型的初始阶段，处理被分为基于包络功率线索的“包络路径”和基于连续过零时间间隔分布的“TFS路径”。这产生了信封和TFS线索的独立可检测性指数，将其最佳组合以产生单一决策统计。调整包络和TFS路径中的独立内部噪声以匹配数据。模拟表明，对于年轻的听力正常的听者，TFS线索需要解释FM数据，而对于年长的听力正常的听者和听力受损的听者，TFS处理都会受损。通过将单耳FM敏感性与双耳相位差的测量联系起来，进一步评估了TFS的作用，通常认为双耳TFS敏感性依赖于双耳FM敏感性。该模型表明，双耳TFS灵敏度远低于单耳TFS灵敏度。与FM阈值类似，双耳相位差敏感性随着年龄和听力损失而下降，尽管双耳时间处理比单耳处理的下降幅度更大。总的来说，该模型提供了一种新的工具来探索正常听觉系统中FM处理的机制，以及FM敏感性随年龄和听力损失的降低。

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