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首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >The Spiral Staircase: Tonotopic Microstructure and Cochlear Tuning
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The Spiral Staircase: Tonotopic Microstructure and Cochlear Tuning

机译:螺旋楼梯:异位微结构和耳蜗调整

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摘要

Although usually assumed to be smooth and continuous, mammalian cochlear frequency-position maps are predicted to manifest a staircase-like structure comprising plateaus of nearly constant characteristic frequency separated by abrupt discontinuities. The height and width of the stair steps are determined by parameters of cochlear frequency tuning and vary with location in the cochlea. The step height is approximately equal to the bandwidth of the auditory filter (critical band), and the step width matches that of the spatial excitation pattern produced by a low-level pure tone. Stepwise tonotopy is an emergent property arising from wave reflection and interference within the cochlea, the same mechanisms responsible for the microstructure of the hearing threshold. Possible relationships between the microstructure of the cochlear map and the tiered tonotopy observed in the inferior colliculus are explored.
机译:尽管通常被认为是平滑和连续的,但哺乳动物的耳蜗频率位置图被预测会显示出一种阶梯状结构,包括几乎恒定的特征频率的平台,这些平台被突然的间断所分隔。阶梯的高度和宽度由耳蜗频率调谐的参数确定,并随耳蜗中的位置而变化。阶跃高度大约等于听觉滤波器的带宽(临界带),阶跃宽度与由低级纯音产生的空间激励图案的阶跃宽度匹配。逐步的体位疗法是由耳蜗内的波反射和干扰引起的一种新兴性质,这是造成听力阈值微观结构的相同机制。探索了耳蜗图的微观结构与在下丘脑中观察到的分层的拓扑学之间的可能关系。

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