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Task and Regions Specific Top-Down Modulation of Alpha Rhythms in Parietal Cortex.

Paolo Capotosto1, Antonello Baldassarre1, Carlo Sestieri1

  • 1Department of Neuroscience, Imaging, and Clinical Science, Institute of Advanced Biomedical Technologies (ITAB), University "G. D'Annunzio", Via dei Vestini 33, Chieti 66100, Italy.

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|September 8, 2016
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Summary

Alpha brain wave changes are task-specific, not general. Repetitive transcranial magnetic stimulation (rTMS) showed that targeting specific brain regions selectively impacts anticipatory alpha desynchronization and performance in different cognitive tasks.

Keywords:
anticipatory alphaparietal cortexrTMSsemantic decisionvisuospatial attention

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Area of Science:

  • Cognitive Neuroscience
  • Neurophysiology
  • Human Brain Imaging

Background:

  • Alpha (8-12 Hz) power desynchronization is linked to visual perception and task anticipation.
  • Previous studies showed repetitive transcranial magnetic stimulation (rTMS) of the dorsal attention network (DAN) disrupts anticipatory alpha desynchronization and performance in visuospatial attention (VSA) tasks.

Purpose of the Study:

  • To test if alpha desynchronization is task-specific.
  • To investigate if alpha desynchronization can be selectively modulated by interfering with different parietal regions.
  • To contrast the effects of rTMS on alpha rhythms and behavior in VSA and semantic decision tasks.

Main Methods:

  • Used repetitive transcranial magnetic stimulation (rTMS) to interfere with brain activity.
  • Targeted the posterior intraparietal sulcus (pIPS), a core region of the DAN, and the angular gyrus (AG), a core region of the default mode network (DMN).
  • Assessed effects on alpha rhythms and behavioral performance during visuospatial attention (VSA) and semantic decision tasks.

Main Results:

  • rTMS of the pIPS affected performance and anticipatory alpha desynchronization only during the VSA task.
  • rTMS of the AG affected performance and anticipatory alpha desynchronization only during the semantic decision task.
  • These findings suggest distinct parietal regions modulate alpha rhythms for specific tasks.

Conclusions:

  • Alpha desynchronization is modulated by distinct parietal channels, reflecting task-specific excitability.
  • These findings indicate specialized parietal networks for cognitive control and task anticipation.
  • The study highlights the task-specific nature of neural mechanisms underlying attention and cognitive processing.