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Chaotic Dynamics Mediate Brain State Transitions, Driven by Changes in Extracellular Ion Concentrations.

Rune Rasmussen1, Mogens H Jensen2, Mathias L Heltberg2

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|December 18, 2017
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Summary

Decreasing calcium-dependent potassium channel conductance, not just ion changes, triggers the sleep-to-wake transition in neurons. This shift moves brain activity from stable sleep oscillations to chaotic wake dynamics.

Keywords:
chaosionsmodelingsleepstate transitionwakefulness

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Computational Biology

Background:

  • Sleep-wake transitions involve complex neuronal activity and extracellular ion concentration changes.
  • Previous in vivo studies faced challenges in isolating the roles of neuronal activity versus ion concentrations due to their interdependence.

Purpose of the Study:

  • To computationally investigate the primary initiator of the sleep-to-wake transition.
  • To differentiate the roles of extracellular ion concentrations and neuronal channel conductance in state transitions.

Main Methods:

  • Extension of the Averaged-Neuron model to simulate neuronal dynamics.
  • Analysis of neuronal firing patterns, oscillations, and chaotic dynamics.

Main Results:

  • Decreased conductance of calcium-dependent potassium channels, not solely ion concentration shifts, initiates the sleep-to-wake transition.
  • Sleep is characterized by stable, self-sustained neuronal firing oscillations.
  • Awake states (quiet and active) exhibit irregular oscillations and chaotic dynamics, with transitions prompted by ionic changes.

Conclusions:

  • The transition from sleep to wakefulness is primarily driven by a decrease in calcium-dependent potassium channel conductance.
  • Waking involves a shift from stable to chaotic neuronal firing, with chaotic dynamics ensuring smooth, noise-robust state transitions.