Build-up of the tendency to segregate auditory streams: Resetting effects evoked by a single deviant tone
Build-up of the tendency to segregate auditory streams: Resetting effects evoked by a single deviant tone
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DOI：
10.1121/1.3488675
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发表时间：
2010-11-01
影响因子：
2.4
通讯作者：
Roberts, Brian
中科院分区：
文献类型：
--
作者：
Haywood, Nicholas R.;Roberts, Brian
将交替的低(L)和高频(H)音调序列作为两个流收听的倾向可以通过先前的感应序列来增加，即使是只由同频音组成的序列也是如此。四个实验使用这样的诱导序列(10个相同的L声调)在由L和H声调组成的较短的测试序列中促进分离。以前的研究表明，当声学特性的突然变化将所有感应音与其测试序列对应的声音区分开来时，流分离的建立通常会大大减少。实验1表明，通过改变最终诱因(在频率、水平、持续时间或以沉默代替)产生的单一异常音调减少了报告的分离，通常是相当大的。实验2部分复制了这一发现，使用时间分辨的变化作为分流的衡量标准。实验3和实验4改变了应用于变异音调的频率变化的大小；重置的程度仅随着大小的变化而逐渐改变。结果表明，一旦变化大到足以引起注意，重置就会开始发生。由于先前的诱导物在异常音调条件下总是保持不变，因此提出了一种单一的改变积极地重置由诱导序列引起的建立。(C)2010年美国声学学会。[DOI：10.1121/1.3488675]
The tendency to hear a sequence of alternating low (L) and high (H) frequency tones as two streams can be increased by a preceding induction sequence, even one composed only of same-frequency tones. Four experiments used such an induction sequence (10 identical L tones) to promote segregation in a shorter test sequence comprising L and H tones. Previous studies have shown that the build-up of stream segregation is usually reduced greatly when a sudden change in acoustic properties distinguishes all of the induction tones from their test-sequence counterparts. Experiment 1 showed that a single deviant tone, created by altering the final inducer (in frequency, level, duration, or replacement with silence) reduced reported segregation, often substantially. Experiment 2 partially replicated this finding, using changes in temporal discrimination as a measure of streaming. Experiments 3 and 4 varied the size of a frequency change applied to the deviant tone; the extent of resetting varied with size only gradually. The results suggest that resetting begins to occur once the change is large enough to be noticeable. Since the prior inducers always remained unaltered in the deviant-tone conditions, it is proposed that a single change actively resets the build-up evoked by the induction sequence. (C) 2010 Acoustical Society of America. [DOI: 10.1121/1.3488675]