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Perception and selectivity of sound duration in the central auditory midbrain

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Author:: No author available

Journal Title:: ACTA PHYSIOLOGICA SINICA

Issue:: 4

DOI:: No doi available

Key Word:: 时程调谐;时间整合;中枢听觉系统;下丘

Abstract：声音的时程信息对动物的声通讯和人的言语识别非常重要.声信号中的大部分信息都编码在随时间变化的振幅和频谱中.听中枢神经元对声音时程的调谐先后在蛙、蝙蝠、小鼠等动物的下丘及以上结构内发现,其在声信号识别和声信息承载方面发挥重要作用;以人为对象的心理物理学研究也观察到发声的时程对语音识别和语义分析非常重要.时程调谐的神经机制目前尚不清楚,可能是兴奋性输入和抑制性输入按某种模式进行的整合.巧合检测模型和反巧合模型等可解释某些类型的时程选择性神经元上的调谐机制,而神经元自身的结构特性也可能与时程调谐的形成有关.时程调谐还受到声音的其他参量(如频谱构成、强度、重复率等)影响,时程选择性神经元可根据这些参量的动态变化凸显特殊生境下的有意义声信号.本文在相关研究工作基础之上,结合本实验室的研究结果,对中枢听神经元的时程编码特性和机制,以及某些声信号参数对神经元时程编码的影响和时程调谐的生物学意义作介绍和评述.

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