This video describes the principal of the blood-oxygen-level dependent (BOLD) signal in functional Magnetic Resonance Imaging (fMRI). Researchers use modern fMRI to detect changes in the brain's blood flow and determine which regions are most active.

Using our innovative visualization techniques, we created 3D visualizations depicting the changes in brain activity measured by fMRI. We then zoom down to the cellular level to illustrate how neurons fire and blood flow increases.

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