Neural correlates of impulsivity in amphetamine use disorder

Area of Science:

• Neuroscience
• Psychiatry
• Addiction Research

Background:

• Impulsivity is a key trait in addictive disorders, yet its neural underpinnings in substance use disorders are understudied.
• Limited neuroimaging research exists on the neural circuitry of impulsivity in individuals with substance use disorders.

Purpose of the Study:

• To investigate functional connectivity in neural networks associated with impulsivity.
• To examine these neural networks in individuals with severe amphetamine use disorder compared to healthy controls.

Main Methods:

• Utilized resting-state functional magnetic resonance imaging (fMRI) to measure functional connectivity.
• Assessed trait impulsivity using the Barratt Impulsiveness Scale-11.
• Analyzed data from a sample of 32 individuals with amphetamine use disorder and 27 healthy controls.

Main Results:

• Amphetamine users reported significantly higher impulsivity scores than controls.
• A widespread prefrontal hyperconnectivity was observed in amphetamine users.
• Higher impulsivity scores positively correlated with this prefrontal hyperconnectivity.

Conclusions:

• Aberrant prefrontal functional connectivity is implicated in severe amphetamine addiction.
• Findings underscore the role of prefrontal network dysfunction in addictive disorders.