SPATIOTEMPORAL ENCODING OF SOUND LEVEL - MODELS FOR NORMAL ENCODING AND RECRUITMENT OF LOUDNESS
SPATIOTEMPORAL ENCODING OF SOUND LEVEL - MODELS FOR NORMAL ENCODING AND RECRUITMENT OF LOUDNESS
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DOI：
10.1016/0378-5955(94)90084-1
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发表时间：
1994-06-01
期刊：
影响因子：
2.8
通讯作者：
CARNEY, LH
中科院分区：
文献类型：
--
作者：
CARNEY, LH
本研究探讨了声级编码在听觉神经纤维时空反应模式中的假说。AN纤维响应的时间特性取决于由于听觉外周的非线性引起的声级。特别地，内耳的压缩非线性引入了作为水平的函数的AN纤维的响应的定时的系统变化。取决于声级和特征频率（CF）的单纤维响应的变化导致AN纤维种群间时空响应模式的系统变化。本研究调查的时空响应模式的变化作为一个功能的水平使用的低频AN纤维的响应的计算模型。可以提取以这种形式编码的信息的机制是跨不同CF的AN纤维的重合检测。这项研究表明，这一机制可能在简单和复杂刺激的声级编码中发挥作用。该模型表明，这种编码方案将受到听觉病理的影响，影响周边压缩非线性的方式是一致的，招募的响度，这往往伴随着感音神经性听力损失的现象。
This study explores the hypothesis that sound level is encoded in the spatiotemporal response patterns of auditory nerve (AN) fibers. The temporal properties of AN fiber responses depend upon sound level due to nonlinearities in the auditory periphery. In particular, the compressive nonlinearity of the inner ear introduces systematic changes in the timing of the responses of AN fibers as a function of level. Changes in single fiber responses that depend upon both sound level and characteristic frequency (CF) result in systematic changes in the spatiotemporal response patterns across populations of AN fibers. This study investigates the changes in the spatiotemporal response patterns as a function of level using a computational model for responses of low-frequency AN fibers. A mechanism that could extract information encoded in this form is coincidence detection across AN fibers of different CFs. This study shows that this mechanism could play a role in encoding of sound level for simple and complex stimuli. The model demonstrates that this encoding scheme would be influenced by auditory pathology that affects the peripheral compressive nonlinearity in a way that is consistent with the phenomenon of recruitment of loudness, which often accompanies sensorineural hearing loss.