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Trait Impulsivity Associated With Altered Resting-State Functional Connectivity Within the Somatomotor Network.

Aleksandra M Herman1,2, Hugo D Critchley3,4, Theodora Duka2,5

  • 1Department of Psychology, Royal Holloway, University of London, Egham, United Kingdom.

Frontiers in Behavioral Neuroscience
|July 17, 2020
PubMed
Summary

Higher impulsivity in healthy adults is linked to weaker functional brain connectivity. Specifically, reduced connectivity between visual areas and the somatomotor network may impair self-regulation.

Keywords:
Barratt Impulsiveness Scalefunctional connectivityresting statesomatomotor networktrait impulsivity

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Imaging

Background:

  • Self-regulation involves coordinated brain system interactions.
  • Behavioral dysregulation, like impulsivity, can be studied using resting-state functional connectivity.
  • Understanding brain mechanisms of self-regulation offers insights into regulatory failures.

Purpose of the Study:

  • To investigate if individual differences in trait impulsivity correlate with functional brain network architecture.
  • To explore the relationship between self-reported impulsivity and connectivity within and between resting-state brain networks.

Main Methods:

  • Thirty healthy participants completed a trait impulsivity self-report measure.
  • Resting-state functional magnetic resonance imaging (fMRI) was employed.
  • Probabilistic Independent Components Analysis (FSL MELODIC) identified 10 resting-state networks.

Main Results:

  • Greater self-reported impulsivity was associated with decreased functional connectivity between the right lateral occipital cortex and the somatomotor network.
  • No significant differences in between-network connectivity were observed.
  • A specific 'decoupling' was noted between visual/somatosensory cortices and behavioral control.

Conclusions:

  • The somatomotor network and its interaction with sensory cortices are implicated in controlling impulsivity.
  • Reduced connectivity may hinder the integration of perceptual information with behavioral control, potentially leading to negative outcomes.
  • Findings highlight the role of specific brain network interactions in self-regulation and impulsivity.