Spontaneous cortical activity in awake monkeys composed of neuronal avalanches

Thomas Petermann, Tara C. Thiagarajan, Mikhail A. Lebedev, Miguel A.L. Nicolelis, Dante R. Chialvo, Dietmar Plenz

Research output: Contribution to journalArticlepeer-review

357 Citations (Scopus)

Abstract

Spontaneous neuronal activity is an important property of the cerebral cortex but its spatiotemporal organization and dynamical framework remain poorly understood. Studies in reduced systems - tissue cultures, acute slices, and anesthetized rats - show that spontaneous activity forms characteristic clusters in space and time, called neuronal avalanches. Modeling studies suggest that networks with this property are poised at a critical state that optimizes input processing, information storage, and transfer, but the relevance of avalanches for fully functional cerebral systems has been controversial. Here we show that ongoing cortical synchronization in awake rhesus monkeys carries the signature of neuronal avalanches. Negative LFP deflections (nLFPs) correlate with neuronal spiking and increase in amplitude with increases in local population spike rate and synchrony. These nLFPs form neuronal avalanches that are scale-invariant in space and time and with respect to the threshold of nLFP detection. This dimension, threshold invariance, describes a fractal organization: smaller nLFPs are embedded in clusters of larger ones without destroying the spatial and temporal scale-invariance of the dynamics. These findings suggest an organization of ongoing cortical synchronization that is scale-invariant in its three fundamental dimensions - time, space, and local neuronal group size. Such scale-invariance has ontogenetic and phylogenetic implications because it allows large increases in network capacity without a fundamental reorganization of the system.

Original languageEnglish
Pages (from-to)15921-15926
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume106
Issue number37
DOIs
Publication statusPublished - 15 Sep 2009
Externally publishedYes

Keywords

  • Neuronal synchronization
  • Ongoing activity
  • Resting state
  • Rhesus monkey
  • Spontaneous activity

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