响应视觉和触觉序列形状信息处理任务的模态特异性频谱动力学:一项使用多变量模式分类分析的脑磁图研究。

Modality-specific spectral dynamics in response to visual and tactile sequential shape information processing tasks: An MEG study using multivariate pattern classification analysis.

作者信息

Gohel Bakul, Lee Peter, Jeong Yong

机构信息

Department of Bio and Brain Engineering, Korea Advance Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.

Department of Bio and Brain Engineering, Korea Advance Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.

出版信息

Brain Res. 2016 Aug 1;1644:39-52. doi: 10.1016/j.brainres.2016.04.068. Epub 2016 Apr 29.

Abstract

Brain regions that respond to more than one sensory modality are characterized as multisensory regions. Studies on the processing of shape or object information have revealed recruitment of the lateral occipital cortex, posterior parietal cortex, and other regions regardless of input sensory modalities. However, it remains unknown whether such regions show similar (modality-invariant) or different (modality-specific) neural oscillatory dynamics, as recorded using magnetoencephalography (MEG), in response to identical shape information processing tasks delivered to different sensory modalities. Modality-invariant or modality-specific neural oscillatory dynamics indirectly suggest modality-independent or modality-dependent participation of particular brain regions, respectively. Therefore, this study investigated the modality-specificity of neural oscillatory dynamics in the form of spectral power modulation patterns in response to visual and tactile sequential shape-processing tasks that are well-matched in terms of speed and content between the sensory modalities. Task-related changes in spectral power modulation and differences in spectral power modulation between sensory modalities were investigated at source-space (voxel) level, using a multivariate pattern classification (MVPC) approach. Additionally, whole analyses were extended from the voxel level to the independent-component level to take account of signal leakage effects caused by inverse solution. The modality-specific spectral dynamics in multisensory and higher-order brain regions, such as the lateral occipital cortex, posterior parietal cortex, inferior temporal cortex, and other brain regions, showed task-related modulation in response to both sensory modalities. This suggests modality-dependency of such brain regions on the input sensory modality for sequential shape-information processing.

摘要

对不止一种感觉模态做出反应的脑区被定义为多感觉区。关于形状或物体信息处理的研究表明,无论输入的感觉模态如何,外侧枕叶皮层、顶叶后皮层和其他区域都会被激活。然而,使用脑磁图(MEG)记录时,这些区域在处理传递给不同感觉模态的相同形状信息任务时,是否表现出相似的(模态不变)或不同的(模态特异)神经振荡动力学,目前尚不清楚。模态不变或模态特异的神经振荡动力学分别间接表明特定脑区参与了与模态无关或与模态相关的过程。因此,本研究以频谱功率调制模式的形式,研究了神经振荡动力学在视觉和触觉序列形状处理任务中的模态特异性,这些任务在感觉模态之间的速度和内容方面匹配良好。使用多变量模式分类(MVPC)方法,在源空间(体素)水平上研究了与任务相关的频谱功率调制变化以及感觉模态之间的频谱功率调制差异。此外,为了考虑逆解引起的信号泄漏效应,整个分析从体素水平扩展到独立成分水平。多感觉和高阶脑区,如外侧枕叶皮层、顶叶后皮层、颞下皮层和其他脑区的模态特异频谱动力学,在对两种感觉模态的反应中均表现出与任务相关的调制。这表明这些脑区在序列形状信息处理中对输入感觉模态的模态依赖性。

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