Department of Neuroscience and Department of Surgery Otolaryngology, University of Connecticut Health Center, Farmington, Connecticut 06030, USA.
J Acoust Soc Am. 2012 Jan;131(1):409-15. doi: 10.1121/1.3662056.
An acoustic pointing task was used to measure extents of laterality produced by combinations of ongoing envelope-based interaural temporal disparities (ITDs) and interaural intensitive disparities (IIDs) of 4-kHz-centered raised-sine stimuli [Bernstein and Trahiotis, J. Acoust. Soc. Am. 125, 3234-3242 (2009),] while varying, parametrically, their peakedness, depth of modulation, and frequency of modulation. The study was designed to assess whether IIDs act as "weights" within the putative "binaural display" at high spectral frequencies (where the envelopes convey ITD-information) as appears to be the case at low spectral frequencies (where the waveforms, i.e., fine-structure and envelopes, convey ITD-information). The data indicate that envelope-based IIDs do principally act as weights and that they appear to exert their influence on lateral position independently of the influence of ITDs. Quantitative analyses revealed that an augmented form of the cross-correlation-based "position-variable" model of Stern and Shear [J. Acoust. Soc. Am. 100, 2278-2288 (1996)] accounted for 94% of the variance in the data. This success notwithstanding, for a small subset of the data, predictions could be improved by assuming that the listeners utilized information within auditory filters having center frequencies above 4 kHz.
采用声指向任务来测量由持续包络的耳间时间差 (ITD) 和以 4 kHz 为中心的升高正弦刺激的耳间强度差 (IID) 的组合产生的侧化程度[Bernstein 和 Trahiotis, J. Acoust. Soc. Am. 125, 3234-3242 (2009)]，同时参数化地改变它们的峰值、调制深度和调制频率。该研究旨在评估 IID 是否在高光谱频率（包络传达 ITD 信息）的所谓“双耳显示”中充当“权重”，就像在低光谱频率（波形，即精细结构和包络传达 ITD 信息）中一样。数据表明，基于包络的 IID 主要充当权重，并且它们似乎独立于 ITD 的影响对侧化位置施加影响。定量分析表明，Stern 和 Shear 的基于互相关的“位置变量”模型的增强形式[J. Acoust. Soc. Am. 100, 2278-2288 (1996)]解释了数据的 94%方差。尽管取得了这一成功，但对于一小部分数据，通过假设听众利用中心频率高于 4 kHz 的听觉滤波器内的信息，可以提高预测的准确性。
