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Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
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Statistical Modelling of Cortical Connectivity Using Non-invasive Electroencephalograms
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Cortical connectivity modulation during sleep onset: A study via graph theory on EEG data.

Fabrizio Vecchio1, Francesca Miraglia1,2, Maurizio Gorgoni3

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Human Brain Mapping
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Brain network connectivity changes during sleep onset. Frontal lobe networks become more connected in the sigma band, while other brain areas show reduced connectivity in delta and theta bands.

Keywords:
EEGeLORETAfunctional connectivitygraph theoryprecision medicinesigma bandsleep onset

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Sleep Research

Background:

  • Sleep onset involves distinct electroencephalogram (EEG) changes.
  • Previous studies show centrofrontal rhythm synchronization and prefrontal to posterior signal spread.

Purpose of the Study:

  • To investigate changes in brain network "small world" characteristics during the wakefulness-sleep transition.
  • To compare pre- and post-sleep onset epochs using EEG rhythms.

Main Methods:

  • Analysis of electroencephalogram (EEG) rhythms during sleep onset.
  • Assessment of "small world" network characteristics in frontal and other brain areas.
  • Comparison of network properties in sigma, delta, and theta frequency bands.

Main Results:

  • Sleep onset is associated with increased small world values in the sigma band for frontal lobes, indicating stronger connectivity.
  • A more ordered brain network, signifying disconnection, is observed in delta and theta bands across remaining brain areas.
  • Specific timing and topographical patterns of functional connectivity maintenance in frontal regions are identified.

Conclusions:

  • The study elucidates the mechanisms maintaining frontal brain region connectivity at sleep onset.
  • Findings offer a potential explanation for the observed frontal-to-posterior information flow after sleep onset.
  • The research highlights dynamic network changes during the transition to sleep.