The Analysis of Difference in Brain Function Network Between Positive and Negative Emotions Based on Graph Theory: A Task‐Based Fmri Study

Chang Liu

《World Scientific Research Journal》 8卷3期 (2022/03) Pp. 334-351

https://doi.org/10.6911/WSRJ.202203_8(3).0043

摘要

The purpose of this study is to explore the difference of network topological properties in different emotional states. Functional magnetic resonance imaging (fMRI) data for positive and negative emotion (PNE) states were obtained through strict experimental design. the functional connection strength of each brain region is calculated based on the consistency of wavelet transform, and then the characteristics of each ROI were extracted through sparse representation and network topology attributes, Finally, the two sample T‐test and support vector machine recursive feature elimination(SVM‐RFE) feature selection algorithm were used to screen the positive emotion network and negative emotion network in the brain areas with large differences in network topology attributes. The experimental results show that in terms of network topology, the local information transmission ability of positive emotional network in frontal lobe, occipital lobe and subcortical nucleus is significantly lower than that of negative emotional network. However, the local information transmission ability in parietal lobe and other brain regions is significantly higher than that of negative emotional networks. On the one hand, it is also found that the importance of the thalamus in the process of positive emotional brain network information transmission and the enhancement of its ability as an information distribution center also verify that the thalamus plays an important role in maintaining the excited state of the cerebral cortex. On the other hand, the hippocampus acts as a central node in negative emotion and enhances its ability to collect and distribute information at the same time. Through the findings of this study, we can see that both positive and negative emotions are coordinated by multiple brain regions and the activation of different regions of the brain corresponds to the generation of different emotions. Thalamus and hippocampus play an important role in positive emotional network and negative emotional network respectively. This study provides a reliable basis for the subsequent researches on different emotions.

關鍵字

fMRI ； Emotion ； Wavelet transform ； Brain network ； Network topology attributes

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