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The relationship between alpha burst activity and the default mode network.

Mateusz Rusiniak1, Andrzej Wróbel2, Katarzyna Cieśla3

  • 1Bioimaging Research Center, World Hearing Center of the Institute of Physiology and Pathology of Hearing, Warsaw/Kajetany, Poland; mateusz.rusiniak@gmail.com.

Acta Neurobiologiae Experimentalis
|July 19, 2018
PubMed
Summary
This summary is machine-generated.

Alpha rhythm, originating in the occipital cortex, also shows activity in the Default Mode Network (DMN). Alpha bursting segments (ABS) were found more in DMN regions than the occipital cortex, suggesting new insights into brain networks.

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Area of Science:

  • Neuroscience
  • Brain Imaging
  • Cognitive Science

Background:

  • Alpha rhythm, a key electroencephalography (EEG) signal, is traditionally linked to the occipital cortex.
  • Emerging research suggests a connection between alpha rhythm and the brain's Default Mode Network (DMN).

Purpose of the Study:

  • To investigate the relationship between alpha rhythm and the Default Mode Network (DMN).
  • To identify specific sources and characteristics of alpha rhythm activity within the DMN.

Main Methods:

  • Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) were used in 36 healthy males.
  • EEG source analysis identified alpha bursting segments (ABS), and fMRI localized brain activity.
  • fMRI data was analyzed using PCC-ABS as a regressor to identify associated brain regions.

Main Results:

  • Alpha bursting segments (ABS) were more prevalent in DMN-related brain regions than the occipital cortex.
  • Source analysis and fMRI confirmed ABS activity in the posterior cingulate cortex/precuneus (PCC) was more associated with DMN than occipital regions.
  • fMRI revealed increased blood oxygenation level-dependent (BOLD) signals in DMN nodes (precuneus, prefrontal cortex) when using PCC-ABS as a regressor.

Conclusions:

  • The study confirms the occipital cortex as a source of alpha activity.
  • It provides evidence for additional, specific sources of alpha bursting segments (ABS) within the Default Mode Network (DMN).
  • These findings highlight the DMN's role in alpha rhythm generation and regulation.