MRC Institute of Hearing Research (Scottish Section), Glasgow Royal Infirmary, Alexandra Parade, Glasgow G31 2ER, United Kingdom.
J Acoust Soc Am. 2011 Jul;130(1):312-23. doi: 10.1121/1.3598466.
Localization dominance (one of the phenomena of the "precedence effect") was measured in a large number of normal-hearing and hearing-impaired individuals and related to self-reported difficulties in everyday listening. The stimuli (single words) were made-up of a "lead" followed 4 ms later by a equal-level "lag" from a different direction. The stimuli were presented from a circular ring of loudspeakers, either in quiet or in a background of spatially diffuse babble. Listeners were required to identify the loudspeaker from which they heard the sound. Localization dominance was quantified by the weighting factor c [B.G. Shinn-Cunningham et al., J. Acoust. Soc. Am. 93, 2923-2932 (1993)]. The results demonstrated large individual differences: Some listeners showed near-perfect localization dominance (c near 1) but many showed a much reduced effect. Two-thirds (64/93) of the listeners gave a value of c of at least 0.75. There was a significant correlation with hearing loss, such that better hearing listeners showed better localization dominance. One of the items of the self-report questionnaire ("Do you have the impression of sounds being exactly where you would expect them to be?") showed a significant correlation with the experimental results. This suggests that reductions in localization dominance may affect everyday auditory perception.
本地化优势（“优先效应”现象之一）在大量听力正常和听力受损的个体中进行了测量，并与自我报告的日常听力困难有关。刺激物（单个单词）由一个“先导”组成，随后 4 毫秒后，来自不同方向的相同水平的“滞后”。刺激物从一个扬声器的环形中呈现，要么在安静中，要么在空间扩散的背景噪声中。听众被要求识别他们听到声音的扬声器。本地化优势通过权重因子 c 进行量化[B.G. Shinn-Cunningham 等人，J. Acoust. Soc. Am. 93, 2923-2932（1993）]。结果表明个体差异很大：一些听众表现出近乎完美的本地化优势（c 接近 1），但许多听众的效果大大降低。三分之二（64/93）的听众的 c 值至少为 0.75。与听力损失有显著相关性，即听力较好的听众表现出较好的本地化优势。自我报告问卷中的一个项目（“你是否有声音正好在你期望的位置的印象？”）与实验结果有显著相关性。这表明本地化优势的降低可能会影响日常听觉感知。
