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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
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Multi-electrode Array Recordings of Neuronal Avalanches in Organotypic Cultures
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Temporal correlations in neuronal avalanche occurrence.

F Lombardi1, H J Herrmann1,2, D Plenz3

  • 1Institute of Computational Physics for Engineering Materials, ETH, Zurich, Switzerland.

Scientific Reports
|April 21, 2016
PubMed
Summary
This summary is machine-generated.

Quiet periods in brain activity (neuronal avalanches) are influenced by preceding avalanche size and, in turn, affect subsequent avalanche size. Consecutive avalanche sizes are also correlated, depending on the time between them.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Complex Systems

Background:

  • Ongoing cortical activity exhibits neuronal avalanches, characterized by power-law distributed size and duration.
  • These properties suggest scale invariance and criticality in brain function.
  • However, the triggers for these bursts and their relation to quiescent periods remain poorly understood.

Purpose of the Study:

  • To investigate the temporal correlations between neuronal avalanche sizes and intervening quiet times.
  • To explore the relationship between consecutive avalanche sizes in cortical slice cultures.

Main Methods:

  • Analysis of temporal correlations in neuronal avalanche data from cortex slice cultures.
  • Quantification of the relationship between quiet times and preceding/succeeding avalanche sizes.
  • Examination of correlations between sizes of consecutive avalanches.

Main Results:

  • Quiet times are dependent on the size of the preceding neuronal avalanche.
  • Quiet times influence the size of the subsequent avalanche.
  • Sizes of consecutive avalanches are correlated, with the relationship varying based on the time separation.

Conclusions:

  • This study provides the first quantitative estimate of correlations between activity and quiescence within the neuronal avalanche framework.
  • Findings shed light on the mechanisms underlying spontaneous brain activity and burst dynamics.