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Errors as a Means of Reducing Impulsive Food Choice
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Restricting temptations: neural mechanisms of precommitment.

Molly J Crockett1, Barbara R Braams, Luke Clark

  • 1Behavioural and Clinical Neuroscience Institute and Department of Psychology, University of Cambridge, Cambridge CB1 3EB, UK. molly.crockett@ucl.ac.uk

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|July 30, 2013
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Humans use willpower to resist temptation, but precommitment offers an alternative self-control strategy. Brain imaging reveals distinct neural mechanisms for each, with precommitment engaging the lateral frontopolar cortex (LFPC) more effectively for impulsive individuals.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Decision Science

Background:

  • Willpower involves effortful impulse inhibition but is vulnerable to emotional disruption and depletion.
  • Precommitment, a strategy of voluntarily restricting access to temptations, serves as an alternative self-control mechanism.
  • Understanding the neural underpinnings of these distinct self-control strategies is crucial for addressing impulsive behaviors.

Purpose of the Study:

  • To investigate the distinct neural mechanisms underlying willpower and precommitment using functional magnetic resonance imaging (fMRI).
  • To compare the behavioral effectiveness of willpower and precommitment, particularly in individuals with varying levels of impulsivity.
  • To elucidate the functional connectivity patterns associated with precommitment and its relationship with impulsivity and value-based decision-making.

Main Methods:

  • fMRI scans were employed to measure brain activity during tasks involving willpower and precommitment.
  • Behavioral data were collected to assess choices related to delayed rewards under both self-control conditions.
  • Functional connectivity analyses were performed to examine neural network interactions during precommitment, particularly involving the lateral frontopolar cortex (LFPC).

Main Results:

  • Precommitment proved more effective than willpower in facilitating choices for large delayed rewards, especially in highly impulsive individuals.
  • Willpower was associated with neural activation in the dorsolateral prefrontal cortex (DLPFC), posterior parietal cortex (PPC), and inferior frontal gyrus.
  • Precommitment uniquely engaged the lateral frontopolar cortex (LFPC), which showed increased functional connectivity with DLPFC and PPC in impulsive individuals, mediated by ventromedial PFC value signals.

Conclusions:

  • The findings support a hierarchical model of self-control, positing that the LFPC orchestrates precommitment.
  • Precommitment involves the LFPC controlling action plans in caudal prefrontal regions based on expected value.
  • This research highlights distinct neural pathways for willpower and precommitment, offering insights into modulating impulsive behavior through strategic self-control.