Previous studies of functional magnetic resonance imaging (fMRI) have found that the ‘resting-state’ is more fractal than task performance. Investigating the behaviour of brain signals under naturalistic conditions, we performed fractal analysis of 7T fMRI data (n=55) under movie-watching (Movie; 10mins) and eyes-open with fixation-cross (Rest; 10mins) conditions. Compared to Rest, Movie, the more natural stimulus, showed greater fractal scaling in all three regions analyzed: whole-brain greymatter (adj_p.=0.014, Cohen’s_D=0.34), default mode network (adj_p.=2.55x10-8, Cohen’s_D=0.90), and visual network (adj_p.=6.44x10-10, Cohen’s_D=1.05), reflecting the endogenous scale-invariant state of the brain.
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