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Resting-state modulation of α rhythms by interference with angular gyrus activity.

Paolo Capotosto1, Claudio Babiloni, Gian Luca Romani

  • 1University G. D'Annunzio, Chieti, Italy.

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|August 14, 2013
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Summary

Inhibiting activity in the angular gyrus (AG) enhances resting-state alpha brainwaves. This suggests the AG causally influences alpha rhythms during rest.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • The default mode network (DMN) is active during rest and suppressed during goal-directed tasks.
  • The angular gyrus (AG) is a core region within the DMN, involved in spontaneous neural activity.

Purpose of the Study:

  • To investigate if inhibitory magnetic stimulation of the angular gyrus (AG) enhances resting-state electroencephalography (EEG) alpha rhythms.
  • To determine the causal role of the AG in modulating alpha rhythms during restful wakefulness.

Main Methods:

  • Low-frequency (1 Hz) repetitive transcranial magnetic stimulation (rTMS) was applied to the left and right AG in 15 healthy adults.
  • EEG alpha power density and coherence were measured during resting-state conditions, comparing AG stimulation with sham stimulation.
  • Control stimulation sites included the frontal eye fields (FEF) and intraparietal sulcus (IPS).

Main Results:

  • rTMS over the AG significantly enhanced dominant alpha power density (8-10 Hz) in the occipitoparietal cortex compared to sham stimulation.
  • Right AG-rTMS also increased intrahemispheric alpha coherence (8-10 Hz).
  • Stimulation over FEF or IPS did not produce similar enhancements in alpha rhythms.

Conclusions:

  • The angular gyrus (AG) plays a causal role in the modulation of dominant low-frequency alpha rhythms during resting-state conditions.
  • Targeted inhibition of AG activity can enhance spontaneous alpha oscillations, providing insights into DMN function.