Space multiscale singularity: the reason behind the diversity of brain rhythms? NSR research paper.

After hundreds of millions of years of evolution, the human brain has developed the most complex and unique network structure that can support the strongest brain function.it is known that this network has a series of structural characteristics, such as small world, scale-free, community structure, rich people's club, etc.however, how do these structural features ensure the powerful function of the brain? Or what are the microscopic mechanisms of brain function? We still know very little about it.pixabay / Geralt recently, a collaborative research team from East China Normal University and Hong Kong Baptist University (Dr. Huo Siyu, Dr. Tian Changhai, Dr. Zheng Muhua, Prof. Guan Shuguang, Prof. Zhou Changsong and Prof. Liu Zonghua) recently published in the National Science Review (NSR) Published research papers, pointed out that the real brain structure network has a new singular state spatial multi-scale singular state, its formation is closely related to the symmetry of the network local connection (as shown in the figure below).the connection structure and symmetry of brain region-5 are different from the traditional artificial complex network model. Starting from the real human brain structure network, the research group approximates the collective behavior of a large number of neurons in each brain region as the average field activity described by the neuron cluster quality model to study two different brain networks of different sizes (one is to simplify the brain neural network to 989 nodes) The other is 64 nodes).the authors found that depending on the coupling strength and delay time, the brain network can exhibit an amazing behavior -- the singular state of the whole mediocre but partially synchronized.in addition, the author also reveals the state that the global and local singular states exist at the same time, and they are named spatial multi-scale singular states (as shown in the figure below).spatial multi-scale singular states.(a) order parameters on 64 brain regions; (b) - (d) evolution snapshot of local singular state pattern.in order to explore the formation mechanism of spatial multi-scale singular States, the author further studied the topological symmetry of each brain region, and found that it was positively correlated with the dynamic synchronization degree of the brain region, that is, those brain regions with high topological symmetry act as relay stations in the brain.the author also studied the structure tree group division and function tree group division of the network, and found that there is a close relationship between the structure and function of the brain: in different brain states (normal or abnormal), the activation of different groups or groups in the structure tree can lead to different brain dynamic patterns, so as to achieve different rhythm output Such as δ, θ, α, β and γ waves.the discovery of spatial multi-scale singularities can be used to explain the experimental fact that brain activity has multi rhythm characteristics, and can correspond to different cognitive patterns. Therefore, the new idea of "exploring the formation mechanism of dynamic pattern from the degree of local symmetry of network structure" is expected to become a new method to understand the micro mechanism of macro cognitive function of the brain.Article Information: [click the link below or "read the original" to get the full text] spatial multi scaled chimera states of cerebella cortex network and its intrinsic structure dynamics relationship in human brain