A new study reveals that the brain's collective dynamics—its so-called criticality—are not uniform but organized hierarchically, mirroring the brain's anatomical structure. Researchers from Brazil and Australia found that signatures of criticality change systematically along the known hierarchy in the mouse visual cortex and hippocampus, providing a direct link between neural activity and brain architecture.
Led by Gustavo G. Cambrainha and colleagues, the team applied phenomenological renormalization group methods to large-scale neuronal spiking data from mouse visual cortex and hippocampus. They discovered that criticality exponents, which measure how close a system is to a critical point, vary along the anatomical gradient. Strikingly, exponents based on static properties (like firing rate distributions) showed a gradient in one direction, while the dynamic exponent (related to temporal correlations) pointed in the opposite direction. This measure-dependent organization suggests a richer structure than previously thought.
Moreover, when mice engaged in a visual task, the criticality signatures were strongly modulated, and the correlations among markers across brain regions were sufficient to reconstruct the anatomical hierarchy from the dynamics alone. The scaling exponents followed theoretically predicted relationships and covaried with hierarchical position. The study, posted on the preprint server arXiv, involved recordings from the mouse visual system (areas V1, LM, AL, etc.) and hippocampus during rest and task conditions.
Why does this matter for your brain? These findings suggest that your brain's ability to operate near a critical point—balancing order and chaos for optimal information processing—is not uniform. Different regions may be tuned differently based on their role in the hierarchy. This could explain why some cognitive functions are more robust or flexible than others. Understanding this organization might eventually help design training programs that target specific hierarchical levels to enhance cognitive performance.
What you can do: While you can't directly change your brain's critical exponents, you can engage in activities that promote healthy brain dynamics. Regular cognitive challenges, mindfulness, and physical exercise have been shown to modulate brain activity patterns. Staying mentally active may help maintain a beneficial critical state across hierarchical levels.
Source: arXiv q-bio.NC
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