Interaural correlation sensitivity
Interaural correlation sensitivity
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DOI：
10.1121/1.1383296
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发表时间：
2001-08-01
影响因子：
2.4
通讯作者：
Spurchise, M
中科院分区：
文献类型：
--
作者：
Culling, JF;Colburn, HS;Spurchise, M
使用2 IFC任务在六个频率（250，500，750，1000，1250和1500 Hz）测量1.3-ERB宽频带噪声对耳间相关性差异的敏感性。测量灵敏度指数d '，用于区分多个固定的相关值对。对于每个频率和条件推导累积d'函数。用于区分任何两个相关值的d'可以通过这些值的累积d“s之间的差从累积d'函数中恢复。采用两个条件：噪声带或者单独呈现（窄带条件），或者在相关噪声的宽的、连续的侧翼带的背景下呈现（边缘条件）。在低频下，累积d'函数对接近I的相关性差异的敏感性大于接近0的相关性差异，但在边缘条件下，这种差异不太明显。此外，当将累积d'绘制为以dB为单位的等效信噪比（SNR）的函数时，对于每个相关值，而不是直接针对相关性，观察到更线性的关系。等效SNR是在NoS pi刺激中的耳间相关性等于实验中使用的噪声的耳间相关性时的SNR。最大累积d'在750 Hz以上下降。这种下降是陡峭的流苏比窄带条件。对于窄带条件，总累积d'在收听者之间是可变的。所有累积d'函数使用简单的双参数函数紧密拟合。完整的数据集，平均跨听众，从流苏和窄带条件下进行了拟合，使用函数来描述这些参数随频率的变化，以产生一个内插的曲线族，描述在这些测试之间的频率的灵敏度。这些曲线预测了当复杂的声音（例如语音）被噪声掩盖时由双耳系统恢复的频谱。(C)2001年，美国声学学会。
Sensitivity to differences in interaural correlation was measured for 1.3-ERB-wide bands of noise using a 2IFC task at six frequencies: 250, 500, 750, 1000, 1250, and 1500 Hz. The sensitivity index, d', was measured for discriminations between a number of fixed pairs of correlation values. Cumulative d' functions were derived for each frequency and condition. The d' for discriminating any two values of correlation may be recovered from the cumulative d' function by the difference between cumulative d"s for these values. Two conditions were employed: the noisebands were either presented in isolation (narrow-band condition) or in the context of broad, contiguous flanking bands of correlated noise (fringed condition). The cumulative d' functions showed greater sensitivity to differences in correlation close to I than close to 0 at low frequencies, but this difference was less pronounced in the fringed condition. Also, a more linear relationship was observed when cumulative d' was plotted as a function of the equivalent signal-to-noise ratio (SNR) in dB; for each correlation value, rather than directly against correlation. The equivalent SNR was the SNR at which the interaural correlation in an NoS pi stimulus would equal the interaural correlation of the noise used in the experiment. The maximum cumulative d' declined above 750 Hz. This decline was steeper for the fringed than for the narrow-band condition. For the narrow-band condition, the total cumulative d' was variable across listeners. All cumulative d' functions were closely fitted using a simple two-parameter function. The complete data sets, averaged across listeners, from the fringed and narrow-band conditions were fitted using functions to describe the changes in these parameters over frequency, in order to produce an interpolated family of curves that describe sensitivity at frequencies between those tested. These curves predict the spectra recovered by the binaural system when complex sounds, such as speech, are masked by noise. (C) 2001 Acoustical Society of America.