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Selective modulation of interhemispheric functional connectivity by HD-tACS shapes perception.

Randolph F Helfrich1, Hannah Knepper1, Guido Nolte1

  • 1Department of Neurophysiology and Pathophysiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.

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Synchronized brain activity, specifically gamma-band oscillations, causally influences information flow and perception. This study used transcranial alternating current stimulation (tACS) to demonstrate its functional relevance in cognitive tasks.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Human Brain Activity

Background:

  • Cortical synchronization is proposed as a mechanism for information flow.
  • The causal role of synchronized neuronal activity in information gating remains debated.

Purpose of the Study:

  • To investigate the causal role of gamma-band synchronization in interhemispheric communication.
  • To explore the impact of entrained gamma oscillations on perception and other brain rhythms.

Main Methods:

  • Bilateral high-density transcranial alternating current stimulation (HD-tACS) at 40 Hz was applied.
  • Simultaneous electroencephalographic (EEG) recordings were used to monitor brain activity.
  • An ambiguous motion perception task was employed to assess behavioral effects.

Main Results:

  • In-phase HD-tACS enhanced interhemispheric functional connectivity, while anti-phase stimulation impaired it.
  • Modulations in functional connectivity correlated with performance in the motion perception task.
  • Gamma-band entrainment led to decreased alpha-band power, suggesting an antagonistic relationship between alpha and gamma oscillations.

Conclusions:

  • Synchronized cortical activity, particularly gamma oscillations, plays a causal role in coordinating information flow and conscious perception.
  • The findings support the functional relevance of long-range neuronal coupling for cognition.
  • Evidence for the antagonistic interaction between alpha and gamma oscillations was provided.