The precedence effect: Fusion and lateralization measures for headphone stimuli lateralized by interaural time and level differences
The precedence effect: Fusion and lateralization measures for headphone stimuli lateralized by interaural time and level differences
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DOI：
10.1121/1.4796113
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发表时间：
2013-05-01
影响因子：
2.4
通讯作者：
Stecker, G. Christopher
中科院分区：
文献类型：
--
作者：
Brown, Andrew D.;Stecker, G. Christopher
本研究评估了10名听力正常的听者在不同刺激条件下耳机优先效应的融合和定位优势方面。向听者呈现“超前-滞后”短脉冲对（123 μ s）或这种脉冲对的序列，这些脉冲对被耳间时间或水平差异（ITD或ILD）横向化。听者使用一个触敏显示器来显示在每次试验中呈现的最后的领先-滞后对(1)是感知到一个还是两个位置(2)感知到的位置。在感知到两个位置的情况下，受试者被进一步指示指出感知到的最左边的位置。结果表明，与ILD相比，对于被ITD横向化的刺激，铅-滞后融合更为稳健，特别是当测试刺激的线索与之前的“累积”刺激的线索不同时，这与Krumbholz和Nobbe[2002]一致。j . Acoust。Soc。[j]。出乎意料的是，结果还表明，随着超前-滞后延迟的增加，定位优势减少，这表明优先效应的融合方面可能与积累下的定位优势方面分离。因此，人们认为，融合的形成可以更普遍地理解为听觉对象形成的一个例子，而不是一种增强声音定位的特殊设施。(C) 2013年美国声学学会。[http://dx.doi.org/10.1121/1.4796113]
The present investigation assessed fusion and localization dominance aspects of the precedence effect under headphones across a variety of stimulus conditions in 10 normal-hearing listeners. Listeners were presented with "lead-lag" pairs of brief (123 mu s) impulses or trains of such pairs lateralized by interaural time or level differences (ITD or ILD). Listeners used a touch-sensitive display to indicate for the final lead-lag pair presented on each trial (1) whether one or two locations were perceived and (2) the location perceived. In the event two locations were perceived, subjects were further instructed to indicate the left-most location perceived. Results demonstrated that lead-lag fusion was more robust for stimuli lateralized by ITD than ILD, particularly when cues of the test stimulus differed from cues of the preceding "buildup" stimulus, consistent with Krumbholz and Nobbe [(2002). J. Acoust. Soc. Am. 112, 654-663]. Unexpectedly, results also demonstrated reduced localization dominance with increasing lead-lag delay, suggesting that the fusion aspect of the precedence effect may be dissociated from the localization dominance aspect under buildup. It is thus argued that buildup of fusion might be understood more generally as an example of auditory object formation rather than a special facility for enhanced sound localization. (C) 2013 Acoustical Society of America. [http://dx.doi.org/10.1121/1.4796113]