Yama M F, Small A M
J Acoust Soc Am. 1983 Jan;73(1):285-90. doi: 10.1121/1.388861.
A series of masking experiments was performed with the aim of comparing frequency selectivity for the monaural and binaural systems. The masking stimulus used in this study combined a sinusoid, which was gated simultaneously with the signal, with a continuous broadband noise. Signal frequency was fixed at 500 Hz. In one condition, the tonal masker and noise were interaurally in phase and the signal was phase reversed. In a second condition, noise, tonal masker, and signal were presented to one ear alone. Signal thresholds were obtained as a function of masker frequency for these two conditions. After making an appropriate selection of noise levels, masking functions for the monaural and binaural system conditions were found to agree closely except for a region about their tips where the binaural condition was more detectable. Two possible interpretations of these results are discussed. Either the monaural and binaural systems contain filters each which have similarly shaped skirts, or the frequency selectivity observed under both diotic and dichotic conditions (for large frequency separations of masker and signal) reflect the operation of a common peripheral filter.
进行了一系列掩蔽实验，目的是比较单耳和双耳系统的频率选择性。本研究中使用的掩蔽刺激是将一个与信号同时开启的正弦波与一个连续的宽带噪声相结合。信号频率固定在500赫兹。在一种情况下，音调掩蔽器和噪声在两耳间同相，而信号相位相反。在第二种情况下，噪声、音调掩蔽器和信号仅呈现给一只耳朵。针对这两种情况，获得了作为掩蔽器频率函数的信号阈值。在适当选择噪声水平后，发现单耳和双耳系统条件下的掩蔽函数除了在其峰值附近的一个区域（双耳条件下更易检测）外，非常吻合。讨论了这些结果的两种可能解释。要么单耳和双耳系统各自包含具有相似形状边缘的滤波器，要么在双耳和双声道条件下观察到的频率选择性（对于掩蔽器和信号的大频率间隔）反映了一个共同外周滤波器的作用。
