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arXiv 1606.01017q-bio.NC
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结合EEG源连接性和网络相似性:在人脑中对象分类的应用

Combining EEG source connectivity and network similarity: Application to object categorization in the human brain

Ahmad Mheich, Mahmoud Hassan, Olivier Dufor, Mohamad Khalil, Fabrice Wendling

摘要:

认知神经科学的一个主要挑战是评估人类大脑基于共同特征对视觉刺激进行分类或分组的能力。这个分类过程非常快,在几百毫秒的时间尺度内发生。然而,大规模脑网络的时空动态的精确跟踪仍然是一个未解决的问题。在这里,我们展示了最近开发的称为密集EEG源连接的方法的组合,以识别具有出色的时间和空间分辨率的功能性大脑网络,以及一种称为SimNet的算法,以计算大脑网络的相似性。在这项研究中分析了两类视觉刺激:不动和移动。在每个类别(条件内)和类别之间(条件间)评估网络相似性。结果表明,每个类别内的相似性高,两个类别之间的相似性低。在120- 190 ms的时间段内,观察到在内部和内部条件下计算的相似性之间的显着差异,认为这与视觉识别和记忆访问有关。我们推测,这些观察将有助于从网络的角度理解人脑中的对象分类。

英文摘要:

A major challenge in cognitive neuroscience is to evaluate the ability of the human brain to categorize or group visual stimuli based on common features. This categorization process is very fast and occurs in few hundreds of millisecond time scale. However, an accurate tracking of the spatiotemporal dynamics of large-scale brain networks is still an unsolved issue. Here, we show the combination of recently developed method called dense-EEG source connectivity to identify functional brain networks with excellent temporal and spatial resolutions and an algorithm, called SimNet, to compute brain networks similarity. Two categories of visual stimuli were analysed in this study: immobile and mobile. Networks similarity was assessed within each category (intra-condition) and between categories (inter-condition). Results showed high similarity within each category and low similarity between the two categories. A significant difference between similarities computed in the intra and inter-conditions was observed at the period of 120-190ms supposed to be related to visual recognition and memory access. We speculate that these observations will be very helpful toward understanding the object categorization in the human brain from a network perspective.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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