Hyoungkyu Kim, Ph.D.
November 1(Tue) - November 1(Tue), 2022
4PM
N Centre 86314 & ZOOM (ID: 728-142-6028)
CNIR Seminar
Date: 4pm, Tuesday, Nov 1st
과학 뇌이(가) 예약된 Zoom 회의에 귀하를 초대합니다.
https://us02web.zoom.us/j/7281426028
회의 ID: 728 142 6028 (password: cnir)
Speaker: Hyoungkyu Kim, Ph.D. (Korea University)
Title: Network criticality determines the speed of state transitions and creates internal and external mode switching of the brain
Abstract: Continuous switching between internal and external modes in the brain appears important for generating models of the self and the world. We propose that a large synchronization fluctuation of brain networks, emerging only near criticality (i.e., a balanced state between order and disorder), spontaneously creates temporal windows with distinct preferences for integrating the network’s internal information or for processing external stimuli. Using a computational model, electroencephalography (EEG) analysis, and functional magnetic resonance imaging (fMRI) analysis during alterations of consciousness in humans, we report that synchronized and incoherent networks, respectively, bias toward internal and external information with specific network configurations.We also showed that the network criticality (the condition of explosive synchronization) at a tipping point determines a perturbed network's fast or slow recovery process. A stronger explosive synchronization (ES) condition is easier to lose; otherwise, harder to restore an optimal network state. This computational modeling study was tested with real-world complex dynamical networks, the human brains in general anesthesia, and the stock markets in economic crisis. The results showed the possibility of systematic prediction of early and prolonged recoveries in crisis.