Study On The Natural Frequency Of The Central Node Of Brain Network

The hubs of the brain are the core areas in the brain network,and the hub node is the center of brain information exchange.Studying the central node properties of the brain facilitates an in-depth understanding of brain cognition,emotions,and disease.Because the rhythmic oscillation of the nervous system is one of the basic laws of brain activity.The neural oscillations in different brain regions also have their own natural frequencies,so the brain can be analyzed from the perspective of frequency.Research on the frequency characteristics of the brain of the network hub nodes which can be better understood with brain neural basis of low frequency oscillation.In this paper,we mainly explore the brain signals of each frequency band in the resting state.Firstly,we use the incision point of the important inner and outer sense center node of the left insula to explore its frequency characteristics.Then based on the frequency division method,the space-time characteristics of the hub nodes in the whole brain are explored.Brain and spatial frequency by two hierarchical perspective,to study the natural frequency of the brain and different center nodes connected mode.In the first part of this paper,the central node of the left anterior insula is used as the entry point,and the frequency specificity of the dorsal ventral region of the left insula is explored.Functionally,the left anterior insula is an important central node for processing internal perception and external perception.However,the frequency-specific distribution pattern of the left forebrain island remains unclear.Using the resting state data,the first part of the study found that the two seed regions on the dorsal and ventral sides of the left anterior insula showed a significant frequency specificity from the slow 5 to the slow 2 bands,which was found in the slow 4 to slow 2 bands.There is an interaction between the two seed points,which indicates that the frequency characteristics of the two seed points are different.Overall,this paper found a unique frequency-specific functional connection between the dorsal and ventral sides of the left anterior insula.This finding helps to understand the functional tissue relationship of the left anterior insula.The second part of the paper extends the natural frequency analysis of the central node of the brain from the local to the whole brain level to explore the temporal and spatial characteristics of the central node of the brain.Theoretically it is feasible to analyze the natural frequency characteristics of a certain brain region with hypotheses,but all the brain regions have such strong assumptions.Therefore,the second part of this paper studies the distribution and connection modes of functional center nodes in different depth layers and frequency bands of the whole brain.It was found that the low-frequency brain gray matter surface has more central nodes.This suggests that gray matter at low frequencies remains the center of functional activity of the brain.The spatio-temporal distribution of the nodes shows that the center of the function is not always located in a particular network,it will change as the frequency band and cortical depth change.Thus the functional center has a specific distribution pattern at various depths of the cerebral cortex as well as in the frequency bands.In summary,in the exploration of the natural frequency characteristics of the central node of the whole brain,this paper first takes the local central node of the left insula as the entry point,and then studies it from a global level.The two studies have jointly revealed the natural frequency of the central node and the specific distribution pattern in different frequency bands,which provides an important research direction for the spatial and temporal distribution of the central node,and also allows us to have a deeper understanding of the cognitive processing mechanism of the brain.