Griffiths phase and long-range correlations in a biologically motivated visual cortex model.

ABSTRACT: Activity in the brain propagates as waves of firing neurons, namely avalanches. These waves' size and duration distributions have been experimentally shown to display a stable power-law profile, long-range correlations and 1/f (b) power spectrum in vivo and in vitro. We study an avalanching biologically motivated model of mammals visual cortex and find an extended critical-like region - a Griffiths phase - characterized by divergent susceptibility and zero order parameter. This phase lies close to the expected experimental value of the excitatory postsynaptic potential in the cortex suggesting that critical be-havior may be found in the visual system. Avalanches are not perfectly power-law distributed, but it is possible to collapse the distributions and define a cutoff avalanche size that

SUBMITTER: Girardi-Schappo M 

PROVIDER: S-EPMC4951650 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature