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Related Experiment Video

Updated: May 10, 2026

Simultaneous Transcranial Alternating Current Stimulation and Functional Magnetic Resonance Imaging
10:25

Simultaneous Transcranial Alternating Current Stimulation and Functional Magnetic Resonance Imaging

Published on: June 5, 2017

Transcranial alternating current stimulation modulates large-scale cortical network activity by network resonance.

Mohsin M Ali1, Kristin K Sellers, Flavio Fröhlich

  • 1Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 5, 2013
PubMed
Summary

Transcranial alternating current stimulation (tACS) enhances brain oscillations by leveraging distinct electrical phases to entrain neural networks. This research clarifies tACS mechanisms, paving the way for targeted brain stimulation therapies.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Brain Stimulation

Background:

  • Transcranial direct current stimulation (tDCS) modulates cortical excitability via weak electrical currents.
  • Transcranial alternating current stimulation (tACS) uses sine-wave stimulation for targeted enhancement of cortical oscillations.
  • Mechanisms underlying tACS effects on large-scale neural network dynamics require further elucidation.

Purpose of the Study:

  • To investigate the mechanistic effects of tACS on the spatiotemporal dynamics of large-scale cortical networks.
  • To understand how periodic perturbations from tACS interact with endogenous network rhythms.
  • To validate simulation findings with experimental data from a gyrencephalic brain model.

Main Methods:

  • Simulated large-scale spiking neuron networks with endogenous rhythms.
  • Analyzed the roles of depolarizing and hyperpolarizing tACS phases in neural entrainment.
  • Performed multichannel extracellular recordings in anesthetized ferrets during tACS.

Main Results:

  • Identified distinct roles for tACS phases in entraining network activity towards and away from nonlinearities.
  • Observed resonance dynamics characterized by an Arnold tongue centered on the network's resonance frequency.
  • Experimental data confirmed that weak global perturbations selectively enhance oscillations at the applied tACS frequency.

Conclusions:

  • tACS exerts its effects through distinct phase-dependent entrainment mechanisms influencing network dynamics.
  • The findings provide a mechanistic understanding of tACS at the network level.
  • Supports the development of activity-dependent feedback tACS for tailored brain stimulation.