fMRI-based Multivariate Pattern Analyses Reveal Imagery Modality and Imagery Content Specific Representations in Primary Somatosensory, Motor and Auditory Cortices
fMRI-based Multivariate Pattern Analyses Reveal Imagery Modality and Imagery Content Specific Representations in Primary Somatosensory, Motor and Auditory Cortices
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DOI：
10.1093/cercor/bhw211
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发表时间：
2017-08-01
期刊：
影响因子：
3.7
通讯作者：
de Gelder, Beatrice
中科院分区：
文献类型：
--
作者：
de Borst, Aline W.;de Gelder, Beatrice
先前的研究表明，早期视觉皮层在视觉意象过程中包含刺激的特定内容表征，并且这些表征模式具有感知基础。迄今为止，几乎没有证据表明听觉和触觉领域存在类似的组织。通过基于功能磁共振成像的多变量模式分析，我们发现初级体感、听觉、运动和视觉皮层对触觉图像和声音图像具有区别性。在体感、运动和视觉皮层中，意象模态区别模式与感知模态区别模式相似，这表明这些区域自上而下的调节依赖于与自下而上的感知过程相似的神经表征。此外，我们在初级体感和初级运动皮层中发现了听觉意象中刺激的内容特异性表征的证据。听觉刺激的想象情绪和想象身份都可以在这些区域成功分类。
Previous studies have shown that the early visual cortex contains content-specific representations of stimuli during visual imagery, and that these representational patterns of imagery content have a perceptual basis. To date, there is little evidence for the presence of a similar organization in the auditory and tactile domains. Using fMRI-based multivariate pattern analyses we showed that primary somatosensory, auditory, motor, and visual cortices are discriminative for imagery of touch versus sound. In the somatosensory, motor and visual cortices the imagery modality discriminative patterns were similar to perception modality discriminative patterns, suggesting that top-down modulations in these regions rely on similar neural representations as bottom-up perceptual processes. Moreover, we found evidence for content-specific representations of the stimuli during auditory imagery in the primary somatosensory and primary motor cortices. Both the imagined emotions and the imagined identities of the auditory stimuli could be successfully classified in these regions.