Measurements of the binaural temporal window using a detection task
Measurements of the binaural temporal window using a detection task
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DOI：
10.1121/1.423061
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发表时间：
1998-06-01
影响因子：
2.4
通讯作者：
Summerfield, Q
中科院分区：
文献类型：
--
作者：
Culling, JF;Summerfield, Q
两项实验使用检测任务研究了双耳时间窗口的形状。在实验 1 中，在白噪声突发期间，双耳异相呈现 10 毫秒的突发音调，从耳间不相关变为相关，然后又变回不相关。在每次 2I-FC 试验的一个时间间隔内，该音调出现在噪声的相关部分中。使用 2-down/1-up 自适应程序记录检测阈值。测量相关噪声的不同持续时间（0-960 ms）、突发音频率（125、250、500 和 1000 Hz）以及噪声级别 [20、30、40 和 50 dB(SPL)/Hz] 的阈值。使用双耳掩蔽释放与窗口接纳的噪声的整体耳间相关性相关的假设，将基于九个候选函数的窗口形状拟合到数据。安装的窗户包括前叶和后叶。高斯函数往往比指数函数和舍入指数函数更接近拟合，而简单函数比包含动态范围限制项的函数提供更简洁的拟合。使用简单的高斯拟合，窗口的形状在很大程度上与频率和电平无关，并且各个听众的窗口具有范围从 55 到 188 毫秒的等效矩形持续时间。尽管前叶通常比后叶短，但不对称性是可变的。实验 2 排除了当噪声中的耳间相位变化紧密跟随信号时，前瓣可能是由于听者分心而造成的伪影的可能性。在这个实验中，异相音调是在部分相关噪声爆发期间出现的，在可变间隔后，部分相关噪声变为完全相关噪声。随着间隔的增加，检测音调的阈值上升（即性能恶化）。分心会产生相反的效果。 (C) 1998 年美国声学学会。
Two experiments investigated the shape of the binaural temporal window using a detection task. In experiment 1, a 10-ms tone burst was presented binaurally out-of-phase during a burst of white noise, which changed from being interaurally uncorrelated, to correlated, and back to uncorrelated. The tone occurred during the correlated portion of the noise in one interval of each 2I-FC trial. Detection thresholds were recorded using a 2-down/1-up adaptive procedure. Thresholds were measured for different durations of correlated noise (0-960 ms), frequencies of tone burst (125, 250, 500, and 1000 Hz) and levels of noise [20, 30, 40, and 50 dB(SPL)/Hz]. Window shapes based on nine candidate functions were fitted to the data using the assumption that the binaural masking release was related to the overall interaural correlation of noise admitted by the window. Fitted windows included both a forward and a backward lobe. Gaussian functions tended to give closer fits than exponential and rounded-exponential functions, and simple functions gave mon parsimonious fits that those which included dynamic-range-limiting terms. Using simple Gaussian fits, the shape of the window was largely independent of frequency and level, and the windows for individual listeners had equivalent rectangular durations ranging from 55 to 188 ms. The asymmetry was variable, although forward lobes were generally shorter than backward lobes. Experiment 2 ruled out the possibility that the forward lobe might be an artefact caused by distraction of the listener, when the interaural phase change in the noise closely followed the signal. In this experiment, the out-of-phase tone was presented during a burst of partially correlated noise which changed, after a variable interval, to a fully correlated noise. Thresholds for detecting the tone rose (i.e., performance worsened) as the interval was increased. Distraction would have produced the opposite effect. (C) 1998 Acoustical Society of America.