Klug Jonas, Schmors Lisa, Ashida Go, Dietz Mathias
Department of Medical Physics and Acoustics, University of Oldenburg, 26129 Oldenburg, Germany.
Department of Neuroscience, University of Oldenburg, 26129 Oldenburg, Germany.
J Acoust Soc Am. 2020 Aug;148(2):678. doi: 10.1121/10.0001602.
Lateralization of complex high-frequency sounds is conveyed by interaural level differences (ILDs) and interaural time differences (ITDs) in the envelope. In this work, the authors constructed an auditory model and simulate data from three previous behavioral studies obtained with, in total, over 1000 different amplitude-modulated stimuli. The authors combine a well-established auditory periphery model with a functional count-comparison model for binaural excitatory-inhibitory (EI) interaction. After parameter optimization of the EI-model stage, the hemispheric rate-difference between pairs of EI-model neurons relates linearly with the extent of laterality in human listeners. If a certain ILD and a certain envelope ITD each cause a similar extent of laterality, they also produce a similar rate difference in the same model neurons. After parameter optimization, the model accounts for 95.7% of the variance in the largest dataset, in which amplitude modulation depth, rate of modulation, modulation exponent, ILD, and envelope ITD were varied. The model also accounts for 83% of the variances in each of the other two datasets using the same EI model parameters.
复杂高频声音的侧向化通过包络中的耳间声级差（ILD）和耳间时间差（ITD）来传递。在这项研究中，作者构建了一个听觉模型，并模拟了来自之前三项行为学研究的数据，总共使用了1000多种不同的调幅刺激。作者将一个成熟的听觉外周模型与一个用于双耳兴奋-抑制（EI）相互作用的功能计数比较模型相结合。在对EI模型阶段进行参数优化后，EI模型神经元对之间的半球速率差与人类听众的侧向化程度呈线性相关。如果某个ILD和某个包络ITD各自导致相似程度的侧向化，它们在相同的模型神经元中也会产生相似的速率差。经过参数优化后，该模型解释了最大数据集中95.7%的方差，在该数据集中，调幅深度、调制速率、调制指数、ILD和包络ITD均有所变化。使用相同的EI模型参数，该模型还解释了其他两个数据集中每个数据集83%的方差。
