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Transcranial direct current stimulation (tDCS) over the orbitofrontal cortex reduces delay discounting.

Andrea Stefano Moro1,2,3, Daniele Saccenti1,3, Alessandra Vergallito4

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Stimulating the orbitofrontal cortex (OFC) with transcranial direct current stimulation (tDCS) effectively reduces delay discounting (DD), a key factor in decision-making. This finding offers new avenues for treating conditions like addiction.

Keywords:
decision-makingdelay discountingintertemporal choiceneuromodulationorbitofrontal cortexprefrontal cortextranscranial direct current stimulation

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Delay discounting (DD) influences decision-making but its neural basis is unclear.
  • The orbitofrontal cortex (OFC) is implicated in DD, yet its specific role requires further investigation.
  • Understanding DD is crucial for addressing impulse-control disorders.

Purpose of the Study:

  • To investigate the causal role of the OFC in delay discounting.
  • To examine the effects of transcranial direct current stimulation (tDCS) on DD.
  • To explore the relationship between DD, working memory, and impulsivity.

Main Methods:

  • Healthy participants received OFC tDCS using two electrode configurations.
  • Participants completed an intertemporal choice task to quantify DD.
  • Working memory and impulsivity were assessed using established tests.

Main Results:

  • OFC tDCS significantly reduced delay discounting, irrespective of electrode configuration.
  • No correlation was found between DD and working memory performance.
  • Baseline impulsivity did not correlate with DD measures.

Conclusions:

  • The OFC plays a direct role in regulating delay discounting.
  • OFC tDCS is a potential intervention for reducing DD.
  • Future research should explore OFC tDCS for addiction and eating disorders.