Evaluating auditory stream segregation of SAM tone sequences by subjective and objective psychoacoustical tasks, and brain activity
Evaluating auditory stream segregation of SAM tone sequences by subjective and objective psychoacoustical tasks, and brain activity
复制标题
通过主观和客观心理声学任务和大脑活动评估 SAM 音调序列的听觉流分离
作者：
Lena;A. Brechmann;G. Klump;S. Deike
听觉流分离是指对具有不同声学特征的信号流的分离感知。在河流分离的研究中，人们采用了不同的方法。在心理声学中，流分离主要是通过要求受试者报告他们的感受的主观任务来研究的。很少有研究应用了客观的任务，其中流隔离间接评估确定阈值的听觉感受器，取决于是否听觉流隔离或不。此外，大脑活动的知觉测量和生理测量都已被采用，但对它们之间的关系知之甚少。如何从不同的任务和措施的结果是相关的，在本研究中使用的例子依赖于阿坝刺激范式，适用于相同的刺激。我们提出了A和B信号，正弦幅度调制（SAM）的音调提供纯粹的时间，频谱或两种类型的线索，以评估感知流分离及其生理相关性。哪种类型的线索是最突出的是由信号的载波和调制频率（fmod）的选择。在主观任务中，受试者报告了他们的感知，在客观任务中，我们测量了他们检测阿坝序列中B信号时移的灵敏度。作为对流分离基础过程的进一步测量，我们采用了功能性磁共振成像（fMRI）。选择SAM音调参数，通过调整A和B音调之间的fmod差异（Δfmod）来唤起整合（1-流）、分离（2-流）或模糊的听觉感受。这两种心理声学任务的结果显着相关。在fMRI中BOLD反应依赖于A和B SAM音调之间的Δfmod。然而，Δfmod的影响在听觉皮层和额叶区域之间存在差异，这表明与序列的感知模糊程度相关的表征差异。
Auditory stream segregation refers to a segregated percept of signal streams with different acoustic features. Different approaches have been pursued in studies of stream segregation. In psychoacoustics, stream segregation has mostly been investigated with a subjective task asking the subjects to report their percept. Few studies have applied an objective task in which stream segregation is evaluated indirectly by determining thresholds for a percept that depends on whether auditory streams are segregated or not. Furthermore, both perceptual measures and physiological measures of brain activity have been employed but only little is known about their relation. How the results from different tasks and measures are related is evaluated in the present study using examples relying on the ABA- stimulation paradigm that apply the same stimuli. We presented A and B signals that were sinusoidally amplitude modulated (SAM) tones providing purely temporal, spectral or both types of cues to evaluate perceptual stream segregation and its physiological correlate. Which types of cues are most prominent was determined by the choice of carrier and modulation frequencies (fmod) of the signals. In the subjective task subjects reported their percept and in the objective task we measured their sensitivity for detecting time-shifts of B signals in an ABA- sequence. As a further measure of processes underlying stream segregation we employed functional magnetic resonance imaging (fMRI). SAM tone parameters were chosen to evoke an integrated (1-stream), a segregated (2-stream), or an ambiguous percept by adjusting the fmod difference between A and B tones (Δfmod). The results of both psychoacoustical tasks are significantly correlated. BOLD responses in fMRI depend on Δfmod between A and B SAM tones. The effect of Δfmod, however, differs between auditory cortex and frontal regions suggesting differences in representation related to the degree of perceptual ambiguity of the sequences.
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DOI：
10.1073/pnas.0504136102
发表时间：
2005-07-05
影响因子：
11.1
作者：
Fox, MD;Snyder, AZ;Raichle, ME
通讯作者：
Raichle, ME
影响因子：
2.5
作者：
Wilson, E. Courtenay;Melcher, Jennifer R.;Oxenham, Andrew J.
通讯作者：
Oxenham, Andrew J.
DOI：
10.3758/bf03204859
发表时间：
1982
期刊：
Perception & psychophysics
影响因子：
--
作者：
Neff,DL;Jesteadt,W;Brown,EL
通讯作者：
Brown,EL
影响因子：
2.5
作者：
Bartlett, EL;Wang, XQ
通讯作者：
Wang, XQ