Stellmack M A, Dye R H
Parmly Hearing Institute, Loyola University of Chicago, Illinois 60626.
J Acoust Soc Am. 1993 May;93(5):2933-47. doi: 10.1121/1.405813.
Threshold interaural delays were measured for a single interaurally delayed low-frequency target component presented against a background of two, four, six, or eight diotic "distractor" components. In the first experiment, a 753-Hz target and the flanking distractor components were gated on and off simultaneously. In subsequent experiments, the distractors were gated on 25-200 ms prior to the target. In addition, the target and distractor components were given various harmonic configurations. In general, threshold interaural delays were higher in all conditions in which distractors were present relative to thresholds obtained for the target component in isolation. Subjects reported that the pitch of the target component was more salient when an onset asynchrony between the target and distractors was present, but the components were perceived as occupying a single intracranial position in spite of the various interaural delays across the frequency domain. These results suggest that binaural processing of stimuli consisting of a small number of low-frequency temporally overlapping components occurs in a spectrally synthetic manner in which interaural information is combined across the spectrum, even in situations in which the segregation of pitch information occurs.
针对在两个、四个、六个或八个双耳“干扰”成分的背景下呈现的单个双耳延迟低频目标成分，测量了阈限双耳延迟。在第一个实验中，一个753赫兹的目标和侧翼干扰成分同时开启和关闭。在随后的实验中，干扰成分在目标之前25 - 200毫秒开启。此外，目标和干扰成分具有各种谐波配置。一般来说，相对于单独获得的目标成分的阈限，在存在干扰成分的所有条件下，阈限双耳延迟都更高。受试者报告说，当目标和干扰成分之间存在起始异步时，目标成分的音高更突出，但是尽管在频域中存在各种双耳延迟，这些成分仍被感知为占据单个颅内位置。这些结果表明，由少量低频时间上重叠的成分组成的刺激的双耳处理以频谱合成的方式发生，其中双耳信息在整个频谱上组合，即使在音高信息分离的情况下也是如此。
