Neural activity associated with distinguishing concurrent auditory objects
Neural activity associated with distinguishing concurrent auditory objects
复制标题
DOI：
10.1121/1.1434942
复制
发表时间：
2002-02-01
影响因子：
2.4
通讯作者：
McDonald, KL
中科院分区：
文献类型：
--
作者：
Alain, C;Schuler, BM;McDonald, KL
通过事件相关脑电位研究了并发声音分离背后的神经过程。参与者被呈现给参与者的是由多个和声组成的复杂声音，其中一个可能会被错误调谐，从而不再是基音的整数倍。在不同的试验组中，呈现了短、中、长持续时间的声音，参与者指出他们听到的是一种声音(即嗡嗡声)还是两种声音(即嗡嗡声加另一种纯音质量的声音)。当参与者观看无声电影时，也会呈现听觉刺激，以评估错误调谐的谐波可以被自动检测到的程度。错误调谐的谐波作为单独的声音的感觉与两相负正电位有关，在声音开始后分别在约150和350英寸处达到峰值。持续时间长的声音也会引发持续的潜力，当错调的和声从复杂的声音中被感知地分离出来时，这种潜力的幅度会更大。早期的负波，被称为对象相关负波(ORN)，在主动和被动听的过程中都存在，而正波和持续电位中的错误相关变化只有在参与者注意到刺激时才出现。这些结果与听觉场景分析的两阶段模型是一致的，在该模型中，声波被自动分解成可由更高执行功能识别的知觉组。声持续时间对ORN和正波的影响很小，说明并发的声音分离依赖于由失谐的谐波和基于输入刺激基频的预期谐波频率之间的差异而引起的瞬时神经反应。(C)2002年美国声学学会。
The neural processes underlying concurrent sound segregation were examined by using event-related brain potentials. Participants were presented with complex sounds comprised of multiple harmonies, one of which could be mistuned so that it was no longer an integer multiple of the fundamental. In separate blocks of trials, short-, middle-, and long-duration sounds were presented and participants indicated whether they heard one sound (i.e., buzz) or two sounds (i.e., buzz plus another sound with a pure-tone quality). The auditory stimuli were also presented while participants watched a silent movie in order to evaluate the extent to which the mistuned harmonic could be automatically detected. The perception of the mistuned harmonic as a separate sound was associated with a biphasic negative-positive potential that peaked at about 150 and 350 ins after sound onset, respectively. Long duration sounds also elicited a sustained potential that was greater in amplitude when the mistuned harmonic was perceptually segregated from the complex sound. The early negative wave, referred to as the object-related negativity (ORN), was present during both active and passive listening, whereas the positive wave and the mistuning-related changes in sustained potentials were present only when participants attended to the stimuli. These results are consistent with a two-stage model of auditory scene analysis in which the acoustic wave is automatically decomposed into perceptual groups that can be identified by higher executive functions. The ORN and the positive waves were little affected by sound duration, indicating that concurrent sound segregation depends on transient neural responses elicited by the discrepancy between the mistuned harmonic and the harmonic frequency expected based on the fundamental frequency of the incoming stimulus. (C) 2002 Acoustical Society of America.