Rogers W L, Bregman A S
McGill University, Montreal, Quebec, Canada.
Percept Psychophys. 1998 Oct;60(7):1216-27. doi: 10.3758/bf03206171.
In four experiments, the accumulation, over time, of a tendency to hear separate high and low streams in a sequence of high (H) and low (L) tones, presented in a galloping rhythm (HLH-HLH-...), was studied. Each trial was composed of two parts, an induction sequence, then a test sequence, with no break between them. The test sequence was always heard at the far left. When the induction sequence and the test sequence were identical, the presence of the induction sequence increased the tendency for the test sequence to split into two streams. However, when the sequences differed in location (cued by differences in interaural timing or intensity over headphones and by loudspeaker placement in a free field) or when they differed in loudness, the accumulation of the segregative tendency was reset, and the test sequence sounded more integrated. When the induction sequence changed in location or loudness in gradual steps toward the value of the test sequence, resetting was much less. It appears that the accumulation of information about streams in different frequency regions is sensitive to sudden changes in parameters, even when they affect the frequency regions equally. This prevents the system from accumulating data across unrelated events.
在四项实验中，研究了在以疾驰节奏（HLH-HLH-...）呈现的高（H）音和低音（L）音序列中，随着时间推移，将其听为分离的高音流和低音流的倾向的积累情况。每次试验由两部分组成，一个诱导序列，然后是一个测试序列，两者之间无中断。测试序列总是在最左边听到。当诱导序列和测试序列相同时，诱导序列的存在增加了测试序列分裂为两个流的倾向。然而，当序列在位置上不同（通过耳机中双耳时间或强度的差异以及自由场中扬声器的放置来提示）或在响度上不同时，分离倾向的积累被重置，测试序列听起来更具整体性。当诱导序列在位置或响度上朝着测试序列的值逐步变化时，重置的程度要小得多。似乎不同频率区域中关于流的信息积累对参数中的突然变化很敏感，即使这些变化对频率区域的影响相同。这可防止系统在不相关的事件中积累数据。
