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Repetitive transcranial magnetic stimulation over dorsolateral prefrontal cortex modulates value-based learning

Lennart Wittkuhn1, Ben Eppinger2, Lea M Bartsch3

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Inhibiting the left dorsolateral prefrontal cortex (dlPFC) impairs sequential decision-making by hindering the integration of action-outcome information. This suggests the dlPFC is crucial for learning complex sequential relationships.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Decision Science

Background:

  • Adaptive behavior relies on learning action-outcome sequences.
  • The dorsolateral prefrontal cortex (dlPFC) is implicated in decision-making, but its role in sequential integration is unclear.

Purpose of the Study:

  • To investigate the role of the left dlPFC in value-based sequential decision-making.
  • To examine how inhibiting the dlPFC affects the integration of sequential information.

Main Methods:

  • A 3-stage deterministic Markov decision task was used.
  • Low-frequency 1-Hz repetitive transcranial magnetic stimulation (rTMS) was applied to the left dlPFC in young male adults.
  • A within-subject cross-over design compared dlPFC stimulation to vertex stimulation.

Main Results:

  • Left dlPFC inhibition impaired choice accuracy, especially with complex sequential transitions and delayed outcomes.
  • Diffusion model analysis revealed reduced information integration efficiency (attenuated drift rate) after dlPFC rTMS.
  • Disrupted dlPFC function led to persistent deficits in learning sequential relationships.

Conclusions:

  • The left dlPFC is critical for acquiring complex sequential relationships.
  • The dlPFC's role in integrating information across sequential decision states is essential for effective learning and decision-making.