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首页> 外文期刊>The European Journal of Neuroscience >Mapping feature-sensitivity and attentional modulation in human auditory cortex with functional magnetic resonance imaging.
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Mapping feature-sensitivity and attentional modulation in human auditory cortex with functional magnetic resonance imaging.

机译：使用功能性磁共振成像在人类听觉皮层中映射特征敏感度和注意调制。

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Feature-specific enhancement refers to the process by which selectively attending to a particular stimulus feature specifically increases the response in the same region of the brain that codes that stimulus property. Whereas there are many demonstrations of this mechanism in the visual system, the evidence is less clear in the auditory system. The present functional magnetic resonance imaging (fMRI) study examined this process for two complex sound features, namely frequency modulation (FM) and spatial motion. The experimental design enabled us to investigate whether selectively attending to FM and spatial motion enhanced activity in those auditory cortical areas that were sensitive to the two features. To control for attentional effort, the difficulty of the target-detection tasks was matched as closely as possible within listeners. Locations of FM-related and motion-related activation were broadly compatible with previous research. The results also confirmed a general enhancement across the auditory cortex when either feature was being attended to, as compared with passive listening. The feature-specific effects of selective attention revealed the novel finding of enhancement for the nonspatial (FM) feature, but not for the spatial (motion) feature. However, attention to spatial features also recruited several areas outside the auditory cortex. Further analyses led us to conclude that feature-specific effects of selective attention are not statistically robust, and appear to be sensitive to the choice of fMRI experimental design and localizer contrast.
机译：特定于特征的增强是指选择性地参与特定刺激特征的过程，该过程可在编码该刺激属性的大脑相同区域中特别增加响应。尽管在视觉系统中有很多关于这种机制的证明，但是在听觉系统中证据却不太清楚。当前的功能磁共振成像（fMRI）研究针对两个复杂的声音特征（即频率调制（FM）和空间运动）检查了此过程。实验设计使我们能够研究在那些对这两个特征敏感的听觉皮层区域是否选择性地参与FM和空间运动增强活动。为了控制注意力，目标侦听任务的难度在听众中尽可能地匹配。 FM相关和运动相关激活的位置与以前的研究广泛兼容。结果还证实，与被动聆听相比，当同时关注任一功能时，整个听觉皮层都得到了总体增强。选择性注意的特定于功能的效果揭示了针对非空间（FM）功能而不是针对空间（运动）功能增强的新颖发现。但是，对空间特征的关注也招募了听觉皮层以外的几个区域。进一步的分析使我们得出结论，选择性注意的特定功能效应在统计学上并不稳健，并且似乎对功能磁共振成像实验设计和定位器对比度的选择敏感。

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