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Frontoparietal theta stimulation causally links working memory with impulsive decision making.

Georgia E Kapetaniou1, Gizem Vural2, Alexander Soutschek3

  • 1Department of Management, Technology and Economics, ETH Zurich, Switzerland.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 16, 2025
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Summary

Synchronizing brain activity in the frontoparietal network enhances working memory. Disrupting this synchronization increases impulsive choices, suggesting this network is crucial for future-oriented decision-making.

Keywords:
Control networkFrontoparietal theta couplingIntertemporal choiceWorking memorytACS

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Decision Making

Background:

  • Delaying gratification is linked to the dorsolateral prefrontal cortex (dlPFC).
  • The dlPFC is part of a larger frontoparietal network, but its role in decision-making within this network is unclear.
  • Previous research has not fully explored the causal role of frontoparietal interactions in delay of gratification.

Purpose of the Study:

  • To investigate the causal role of frontoparietal network synchronization in delay of gratification.
  • To examine how modulating frontoparietal theta synchronization affects impulsive decision-making and working memory.

Main Methods:

  • Utilized transcranial alternating current stimulation (tACS) at 5 Hz theta frequency to synchronize and desynchronize left frontal and parietal cortices.
  • Participants performed an intertemporal choice task and a 3-back working memory task under in-phase, anti-phase, and sham tACS conditions.

Main Results:

  • In-phase theta tACS improved working memory performance.
  • Anti-phase theta tACS led to more impulsive choices and increased hyperbolic discounting of future rewards.
  • Findings suggest a causal link between frontoparietal network synchronization and future-oriented decision-making.

Conclusions:

  • Future-oriented decision making causally relies on synchronous activation within the frontoparietal network.
  • Working memory processes within this network are integral to delaying gratification.
  • Modulating frontoparietal synchronization offers a potential avenue for understanding and influencing decision-making behavior.