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Fractal-Based Analysis of Movie Watching vs. Eyes-Open Resting State Reveals Widespread Differences in fMRI Signal Complexity
Olivia Lauren Campbell1, Tamara Vanderwal1, and Alexander Mark Weber1
1University of British Columbia, Vancouver, BC, Canada
Watching a movie induces greater fractal scaling, or scale-invariance, in the brain than the conventional resting-state condition (eyes fixated on cross-hairs), reflecting a more natural state that is quantifiable and may be a useful subject- and network-specific baseline reference value.
Figure 3: The Experimental-Naturalistic Spectrum. Movie-watching H values reflect a more fractal state than resting-state. Previous findings using conventional experimental tasks that require isolated and discrete cognitive processes (example, Stroop Task) report H values that lie closer to the “high experimental control” end of the spectrum.
Table 1. Hurst Values in Greymatter, DMN, and Visual Network.