Effects of the build-up and resetting of auditory stream segregation on temporal discrimination
Effects of the build-up and resetting of auditory stream segregation on temporal discrimination
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DOI：
10.1037/0096-1523.34.4.992
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发表时间：
2008-08-01
影响因子：
2.1
通讯作者：
Moore, Brian C. J.
中科院分区：
文献类型：
--
作者：
Roberts, Brian;Glasberg, Brian R.;Moore, Brian C. J.
当2个或更多流(分离)时听到音调序列的趋势逐渐形成，但属性的突然变化可能会将感知重置为1个流(集成)。到目前为止，还没有使用流的客观测量来探索这种效果。刺激由2·0-S固定频率诱导器和0·6-S纯音交替测试序列组成(3个低[L]-高[H]循环)。听者比较测试序列同步或H音调稍有延迟的时间间隔。重新设置分离应使识别各向异性间隔变得更容易。改变HL频率间隔(0-12个半音)，并将诱导剂和测试序列的属性设置为相同或不同的值。被操纵的诱导器属性是频率、开始音的数量(几个短脉冲串与一个连续音调)、音调：静音比(短脉冲串与延长脉冲串)、水平和偏侧化。诱导物和L声调之间的所有差异都降低了相对于没有诱导物的情况下的时间辨别阈值，包括先前显示的不会对分离产生重大影响的特性。总体而言，结论是序列中的突然变化会导致重置并改善随后的时间分辨。
The tendency to hear a tone sequence as 2 or more streams (segregated) builds up, but a sudden change in properties can reset the percept to 1 stream (integrated). This effect has not hitherto been explored using an objective measure of streaming. Stimuli comprised a 2.0-s fixed-frequency inducer followed by a 0.6-s test sequence of alternating pure tones (3 low [L]- high [H] cycles). Listeners compared intervals for which the test sequence was either isochronous or the H tones were slightly delayed. Resetting of segregation should make identifying the anisochronous interval easier. The HL frequency separation was varied (0-12 semitones), and properties of the inducer and test sequence were set to the same or different values. Inducer properties manipulated were frequency, number of onsets (several short bursts vs. one continuous tone), tone:silence ratio (short vs. extended bursts), level, and lateralization. All differences between the inducer and the L tones reduced temporal discrimination thresholds toward those for the no-inducer case, including properties shown previously not to affect segregation greatly. Overall, it is concluded that abrupt changes in a sequence cause resetting and improve subsequent temporal discrimination.