Auditory stream segregation in the songbird forebrain: Effects of time intervals on responses to interleaved tone sequences
Auditory stream segregation in the songbird forebrain: Effects of time intervals on responses to interleaved tone sequences
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DOI：
10.1159/000087854
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发表时间：
2005-01-01
影响因子：
1.7
通讯作者：
Klump, GM
中科院分区：
文献类型：
--
作者：
Bee, MA;Klump, GM
对于人类和其他动物，随着时间的推移将单独的声音元素整合到连贯的感知表示或“听觉流”中，并将这些听觉流与其他交织的声音分离的能力对于听觉和语音通信至关重要。在人类和欧洲椋鸟（Sturnus vulgaris）中，能够在感知上分离由两个频率不同的交替音调组成的简单交织音调序列（阿坝-阿坝-.）在A和B音调之间的较大频率间隔（Δ F）处促进A和B音调的分离听觉流。在人类中，将A和B音调分离到不同的流中似乎也在流内音调之间的较短刺激间间隔（ISI）中得到促进（例如，例如，在一个实施例中，在连续的A音调之间）。在这里，我们使用阿坝的实验范式，探讨不同的时间间隔之间的A和B音重复阿坝三联体的神经反应在八哥前脑的影响。本研究的主要发现是，ISI的Delta F依赖效应对A和B音的相对反应有很大的影响。当A和B音在频率上更相似（较小的Delta Fs）并且发生在较短的ISI时，相对于A音反应，对B音的反应被抑制。我们将这些抑制作用归因于生理性前掩蔽，并建议前掩蔽作为一种机制，用于隔离音调空间中交错音调的神经反应。我们讨论了我们的生理数据与以前的电生理研究的听觉流分离在哺乳动物和以前的感知研究在人类。
For both humans and other animals, the abilities to integrate separate sound elements over time into coherent perceptual representations, or ' auditory streams ', and to segregate these auditory streams from other interleaved sounds are critical for hearing and vocal communication. In humans and European starlings ( Sturnus vulgaris) the ability to perceptually segregate a simple interleaved tone sequence comprised of two alternating tones differing in frequency ( ABA - ABA - ABA -...) into separate auditory streams of A and B tones is promoted at larger frequency separations (Delta F) between the A and B tones. In humans, segregating A and B tones into different streams also appears to be promoted at shorter inter-stimulus intervals (ISI) between tones within a stream ( e. g., between consecutive A tones). Here, we used the ABA experimental paradigm to investigate the influence of different time intervals between A and B tones in repeated ABA triplets on neural responses in the starling forebrain. The main finding from the study is that a Delta F-dependent effect of ISI had a large influence on the relative responses to A and B tones. Responses to B tones were suppressed, relative to A-tone responses, when the A and B tones were more similar in frequency ( smaller Delta Fs) and occurred at shorter ISIs. We attribute these suppressive effects to physiological forward masking and suggest that forward masking functions as a mechanism for segregating neural responses to interleaved tones in tonotopic space. We discuss the relevance of our physiological data with respect to previous electrophysiological studies of auditory stream segregation in mammals and previous perceptual studies in humans.