Influences of spatial cues on grouping and understanding sound

Influences of spatial cues on grouping and understanding sound
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空间线索对声音分组和理解的影响

DOI:
10.1016/s0021-9258(17)39448-6
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发表时间:
2005
期刊:
The Journal of biological chemistry
影响因子:
--
通讯作者:
B. Shinn
B. Shinn
中科院分区:
--
文献类型:
--
作者:
B. Shinn

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空间线索,如耳间时间和水平差异,往往对听觉分组有如此微弱的影响,以至于当被其他线索相反时,如共同开始或连续,它们被压倒。在混响的聆听条件下,当在存在竞争噪声的情况下理解声源时,空间线索提供的益处相对较小。然而,日常经验表明,两只耳朵倾听对于能够在真正的鸡尾酒会上交谈至关重要,在这种情况下,通常有多个同时说话的人以及混响的能量。这一明显的悖论可以通过最近的研究部分解释,这些研究表明:1)空间线索对听觉流动的影响可能很强,尽管它们对同时分组的影响很弱;2)空间线索在分离容易相互混淆的竞争声源方面发挥着重要作用,这一优势有别于在混响能量存在时破坏的双耳处理优势。结果表明,空间线索被听觉系统以许多不同的方式、在许多不同的水平上利用。在简单的听力条件下(就像在传统的双耳处理研究中所考察的那样),空间线索可以帮助听者检测到原本可能被屏蔽的声音;但在更复杂的条件下,空间线索对于正确地将声音混合物解析为不同的对象并将注意力集中在感兴趣的来源上至关重要。
Spatial cues such as interaural time and level differences often have such a weak influence on auditory grouping that they are overwhelmed when opposed by other cues, such as common onset or continuity. In reverberant listening conditions, spatial cues provide relatively little benefit when understanding a sound source in the presence of competing noise. Yet everyday experience shows that listening with two ears is critical for being able to converse at a real cocktail party, a case in which there are usually multiple simultaneous talkers as well as reverberant energy. This apparent paradox can be partially explained by recent studies, which demonstrate that 1) the influence of spatial cues on auditory streaming can be strong even though their influence on simultaneous grouping is weak, and 2) spatial cues play an important role in separating competing sound sources that are easily confused with each other, a benefit that is distinct from the binaural-processing benefits that break down in the presence of reverberant energy. Results suggest that spatial cues are utilized by the auditory system in many different ways, at many different levels. In simple listening conditions (like those examined in traditional studies of binaural processing), spatial cues can help a listener detect sound that might otherwise be masked; but in more complex conditions, spatial cues are critical for properly parsing the mixture of sound into different objects and focusing attention on the source of interest.
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