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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Decision Science

Background:

  • Intertemporal decision-making requires evaluating reward magnitude and delay, potentially involving working memory (WM).
  • Understanding the neural basis of self-control in delayed gratification is crucial for behavioral economics and clinical psychology.

Purpose of the Study:

  • To directly compare neural activation during intertemporal decision-making with working memory (WM) load.
  • To investigate the role of the prefrontal cortex in integrating reward dimensions and managing cognitive load during choice.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants completed intermixed working memory and intertemporal decision-making tasks with varying difficulty levels.
  • Task difficulty was individualized based on participants' subjective value functions for delayed rewards.

Main Results:

  • The right anterior prefrontal cortex (aPFC) and dorsolateral prefrontal cortex (dlPFC) showed modulated activity correlating with both WM load and decision difficulty.
  • In dlPFC, increased activation with choice difficulty was prominent in self-controlled individuals, particularly when choosing delayed rewards in difficult trials.
  • Activity modulation by choice difficulty in dlPFC and aPFC were correlated, suggesting a connected neural circuit.

Conclusions:

  • Working memory and intertemporal decision-making share neural resources within the lateral prefrontal cortex, particularly the aPFC and dlPFC.
  • Choice difficulty, rather than just delay, is a key factor modulating prefrontal cortex activity in intertemporal choices.
  • Coordinated activation within the lateral prefrontal cortex supports successful self-control and intertemporal decision-making.