Dye Raymond H, Boomer Joseph, Frankel Joleen, Hill Jacquelyn P, Peloquin Alycia N
Department of Psychology, Loyola University of Chicago, Chicago, Illinois 60660, USA.
J Acoust Soc Am. 2016 Dec;140(6):4472. doi: 10.1121/1.4967839.
This study examined listeners' ability to process interaural temporal differences (ITDs) in one of two sequential sounds when the two differed in spectral content. A correlational analysis assessed weights given to ITDs of simulated source and echo pulses for echo delays of 8-128 ms for conditions in which responses were based on the source or echo, a 3000-Hz Gaussian (target) pulse. The other (distractor) pulse was spectrally centered at 1500, 2000, 3000, 4000, or 5000 Hz. Also measured were proportion correct and proportion of responses predicted from the weights. Regardless of whether the echo or source pulse served as the target, target weight, and proportion correct increased with increasing distractor frequency, consistent with low-frequency dominance [Divenyi, J. Acoust. Soc. Am. 91, 1078-1084 (1992)]. Effects of distractor frequency were observed at echo delays out to 128 ms when the source served as the target, but only out to 64 ms when the echo served as the target. At echo delays beyond 8 ms, recency effects were exhibited with higher proportions correct obtained for judgments based on the echo pulse than the source pulse.
本研究考察了听众在两个相继声音的频谱内容不同时，处理其中一个声音的耳间时间差异（ITD）的能力。相关分析评估了在响应基于源脉冲或回波脉冲（一个3000赫兹的高斯（目标）脉冲）的情况下，对于8至128毫秒的回波延迟，给予模拟源脉冲和回波脉冲的ITD的权重。另一个（干扰）脉冲的频谱中心位于1500、2000、3000、4000或5000赫兹。还测量了正确比例和根据权重预测的响应比例。无论回波脉冲还是源脉冲作为目标，目标权重和正确比例都随着干扰频率的增加而增加，这与低频优势一致[迪维尼伊，《美国声学学会杂志》91，1078 - 1084（1992）]。当源脉冲作为目标时，在长达128毫秒的回波延迟处观察到干扰频率的影响，但当回波脉冲作为目标时，仅在长达64毫秒处观察到干扰频率的影响。在超过8毫秒的回波延迟处，基于回波脉冲的判断比基于源脉冲的判断表现出更高的正确比例，即呈现出近因效应。
