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Poster E in Poster Session E: Thursday, August 6, 10:30 am – 12:15 pm, Kimmel Center, Shorin & Rosenthal Rooms

General Oscillations Theory Reveals Propagation Dynamics at Event Boundaries in Naturalistic Viewing

Eunhee Ji¹, Jehyeop Lee², Jae Hyung Woo³, Hongmi Lee⁴, Seng Bum Michael Yoo¹, Joon-Young Moon¹; ¹Sung Kyun Kwan University, ²Sungkyunkwan University, ³Dartmouth College, ⁴Purdue University

Presenter: Eunhee Ji

Previous studies have shown that event boundaries are accompanied by transient increases in neural activity and large-scale reconfiguration of functional connectivity. An open question is how large-scale brain activity is coordinated across regions during these transitions. Here, we apply the General Oscillations Theory (GOT) framework to decompose analytic fMRI signals into amplitude, synchrony, and phase–lead/lag components, enabling the characterization of propagation-related dynamics. Using fMRI data from a naturalistic movie-viewing dataset, we found that event boundaries were associated with increased global amplitude. Phase-based operators revealed structured reorganization of large-scale dynamics not captured by amplitude alone, with distinct propagation modes unfolding along the unimodal–transmodal cortical hierarchy. These findings indicate that event boundaries involve coordinated changes across multiple dynamical dimensions, highlighting the importance of phase-resolved analyses for large-scale brain dynamics.

Topic Area: Decision-Making, Cognitive Control & Event Cognition