Abstract #2847

Fractal-Based Analysis of fMRI BOLD Signal During Naturalistic Viewing Conditions

Olivia Campbell^1,2, Tamara Vanderwal^2,3, and Alexander Mark Weber^1,2,4,5

¹School of Biomedical Engineering, University of British Columbia, Vancouver, BC, Canada, ²BC Children's Hospital Research Institute, Vancouver, BC, Canada, ³Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada, ⁴Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada, ⁵Department of Neuroscience, University of British Columbia, Vancouver, BC, Canada

Synopsis

We investigated the difference between the brain’s fractal dynamics during movie-watching and resting-state conditions using 7T fMRI data. During movie-watching, we find that the BOLD signal becomes more scale-invariant and self-similar than during the resting-state. This supports the idea that movie-watching evokes a state of optimal neural functioning that may better reflect the endogenous state of the brain than a fixed cross-hair. We also find that fractal properties differ greatly across functional networks, providing novel information about the temporal dynamics of each network during naturalistic processing. Overall, these findings advance understanding of both fractal dynamics and naturalistic viewing in fMRI.

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