Toward a Unified Analysis of the Brain Criticality Hypothesis: Reviewing Several Available Tools

Yu, Chaojun

doi:10.3389/fncir.2022.911245

Cited by 1 publication

(1 citation statement)

References 41 publications

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“…Note that we were unable to use a maximum likelihood estimation (MLE) approach which applies only to probability distributions. MLE, together with Kolmogorov–Smirnov (KS) statistics 63 , 64 or log-likelihood ratios (LLR) between the candidate heavy-tailed distributions 65 , are commonly used to study critical power-law behavior in neural systems 12 , 66 , 67 . However, this approach is only applicable to probability densities.…”

Section: Methodsmentioning

confidence: 99%

Critical scaling of whole-brain resting-state dynamics

2023

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Scale invariance is a characteristic of neural activity. How this property emerges from neural interactions remains a fundamental question. Here, we studied the relation between scale-invariant brain dynamics and structural connectivity by analyzing human resting-state (rs-) fMRI signals, together with diffusion MRI (dMRI) connectivity and its approximation as an exponentially decaying function of the distance between brain regions. We analyzed the rs-fMRI dynamics using functional connectivity and a recently proposed phenomenological renormalization group (PRG) method that tracks the change of collective activity after successive coarse-graining at different scales. We found that brain dynamics display power-law correlations and power-law scaling as a function of PRG coarse-graining based on functional or structural connectivity. Moreover, we modeled the brain activity using a network of spins interacting through large-scale connectivity and presenting a phase transition between ordered and disordered phases. Within this simple model, we found that the observed scaling features were likely to emerge from critical dynamics and connections exponentially decaying with distance. In conclusion, our study tests the PRG method using large-scale brain activity and theoretical models and suggests that scaling of rs-fMRI activity relates to criticality.

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