title: Self-Regulated Dynamical Criticality in Human ECoG.
abstract: Mounting experimental and theoretical results indicate that neural systems are poised near a critical state. In human subjects, however, most evidence comes from functional MRI studies, an indirect measurement of neuronal activity with poor temporal resolution. Electrocorticography (ECoG) provides a unique window into human brain activity: each electrode records, with high temporal resolution, the activity resulting from the sum of the local field potentials of ∼10(5) neurons. We show that the human brain ECoG recordings display features of self-regulated dynamical criticality: dynamical modes of activation drift around the critical stability threshold, moving in and out of the unstable region and equilibrating the global dynamical state at a very fast time scale. Moreover, the analysis also reveals differences between the resting state and a motor task, associated with increased stability of a fraction of the dynamical modes.
authors: Department of Psychology, Columbia University New York, NY, USA.
authors: Guillermo
authors: G
authors: Solovey
authors: Kai J
authors: KJ
authors: Miller
authors: Jeffrey G
authors: JG
authors: Ojemann
authors: Marcelo O
authors: MO
authors: Magnasco
authors: Guillermo A
authors: GA
authors: Cecchi