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The structural scaffolding of the human connectome ( Sporns et al., 2005) constrains the unfolding of large-scale coordinated neural activity towards a restricted functional repertoire ( Deco et al., 2011). This finding opens new avenues to study the relationship between brain structure and neural dynamics. We find that the structural connectome relates to, and likely affects, the rapid spreading of neuronal avalanches, evidenced by a significant association between these transition probabilities and structural connectivity strengths (r = 0.37, p<0.0001).

We characterize the spatio-temporal unfolding of whole-brain activity at the millisecond scale from source-reconstructed MEG data, estimating the probability that any two brain regions will significantly deviate from baseline activity in consecutive time epochs. Here, we use magnetoencephalography (MEG) to quantify the extent to which fast neural dynamics in the human brain are constrained by structural connections inferred from diffusion MRI tractography. Structural connections comprising the human connectome are hypothesized to impose constraints on the dynamics of this activity.

Brain activity during rest displays complex, rapidly evolving patterns in space and time.

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