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Transcranial alternating current stimulation over left DLPFC modulates feedback processing: a simultaneous tACS-fMRI

Ranjan Debnath1, Eva Lenz2, Johannes Tobelander2

  • 1Centre for Psychiatry and Psychotherapy, Justus-Liebig University Giessen, Giessen, Germany. ranjan.debnath@psychiat.med.uni-giessen.de.

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Summary
This summary is machine-generated.

This study shows that theta brainwave stimulation aids processing of negative feedback, while beta brainwave stimulation impacts positive feedback processing. These findings highlight distinct roles for brain oscillations in reward feedback.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Stimulation

Background:

  • Reward feedback processing involves distinct neural networks.
  • Neuronal oscillations, specifically theta and beta rhythms, are crucial for communication within these networks.

Purpose of the Study:

  • To investigate the influence of modulating theta and beta brain oscillations via transcranial alternating current stimulation (tACS) on brain activity during feedback processing.
  • To differentiate the roles of theta and beta oscillations in processing positive (gain) and negative (loss) feedback.

Main Methods:

  • 28 healthy participants underwent three tACS sessions (theta, beta, sham) over the left dorsolateral prefrontal cortex (DLPFC).
  • Participants performed a gambling task while undergoing simultaneous tACS and functional magnetic resonance imaging (fMRI).
  • BOLD activations related to gain and loss feedback were measured.

Main Results:

  • Theta stimulation (5 Hz) enhanced activity in brain regions involved in error monitoring, cognitive control, and emotion regulation during loss feedback.
  • Beta stimulation (25 Hz) modulated activation in areas related to reward sensitivity and emotional processing during gain feedback.

Conclusions:

  • Theta and beta oscillations play distinct roles in processing negative and positive feedback, respectively.
  • tACS can be used to modulate specific brain oscillations and investigate their functions in feedback processing.