Difference in precedence effect between children and adults signifies development of sound localization abilities in complex listening tasks
Difference in precedence effect between children and adults signifies development of sound localization abilities in complex listening tasks
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DOI：
10.1121/1.3478849
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发表时间：
2010-10-01
影响因子：
2.4
通讯作者：
Godar, Shelly P.
中科院分区：
文献类型：
--
作者：
Litovsky, Ruth Y.;Godar, Shelly P.
优先效应指的是人类能够在混响环境中定位声音的事实，因为听觉系统分配给直接声音（前导）的权重大于后到达的声音（滞后）。在这项研究中，绝对声音定位研究的单源刺激和双源铅滞后刺激的4-5岁的儿童和成人。铅滞后延迟范围从5-100毫秒。测试在自由场进行，粉红色的噪音爆发从扬声器定位在一个水平的弧在前场。听众指出听到了多少声音，以及第一次和第二次听到声音的感知位置。结果表明，在短的延迟（高达10毫秒），铅主导的声音定位强烈在两个年龄段，和定位误差是类似的单源刺激。在较长的延迟下，误差可能很大，这是由于超前和滞后的过度整合、由于时间顺序混乱而导致的第一次听到的声音和第二次听到的声音的感知位置的互换以及超前对滞后的主导。儿童的错误比成人更大。结果进行了讨论的背景下，成熟的听觉和非听觉因素。(C)2010年美国声学学会。[DOI 10.1121/1.3478849]
The precedence effect refers to the fact that humans are able to localize sound in reverberant environments, because the auditory system assigns greater weight to the direct sound (lead) than the later-arriving sound (lag). In this study, absolute sound localization was studied for single source stimuli and for dual source lead-lag stimuli in 4-5 year old children and adults. Lead-lag delays ranged from 5-100 ms. Testing was conducted in free field, with pink noise bursts emitted from loudspeakers positioned on a horizontal arc in the frontal field. Listeners indicated how many sounds were heard and the perceived location of the first-and second-heard sounds. Results suggest that at short delays (up to 10 ms), the lead dominates sound localization strongly at both ages, and localization errors are similar to those with single-source stimuli. At longer delays errors can be large, stemming from over-integration of the lead and lag, interchanging of perceived locations of the first-heard and second-heard sounds due to temporal order confusion, and dominance of the lead over the lag. The errors are greater for children than adults. Results are discussed in the context of maturation of auditory and non-auditory factors. (C) 2010 Acoustical Society of America. [DOI: 10.1121/1.3478849]