Nucleus Accumbens Resting State Functional Connectivity is Linked to Family Income, Reward Salience, and Substance...

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Addiction Research

Background:

• The nucleus accumbens (NAcc) is central to the brain's reward system, influencing reward salience and substance use behaviors.
• Socioeconomic status impacts substance use rates, particularly in youth.
• Limited research explores NAcc resting-state functional connectivity (rsFC) with networks beyond the default mode network (DMN) and prefrontal cortex (PFC).

Purpose of the Study:

• To investigate the association between NAcc rsFC and specific brain networks (cingulo-opercular, sensorimotor mouth, sensorimotor hand).
• To examine the role of these NAcc rsFC patterns in linking socioeconomic status, reward salience, and future substance use.
• To explore neural mechanisms underlying substance use risk in relation to socioeconomic factors.

Main Methods:

• Utilized data from the Adolescent Brain Cognitive Development (ABCD) study.
• Assessed NAcc rsFC, socioeconomic status (family income), reward salience, and longitudinal substance use outcomes.
• Employed Structural Equation Modeling to analyze the complex relationships between these variables.

Main Results:

• Higher family income correlated with increased NAcc rsFC and decreased reward salience and future substance use.
• NAcc rsFC strongly predicted higher reward salience and future substance use.
• Reward salience was a significant predictor of future substance use.

Conclusions:

• NAcc rsFC with networks beyond DMN/PFC may mediate the link between low socioeconomic status, heightened reward salience, and substance use risk.
• Findings offer novel insights into the neural underpinnings of substance use vulnerability.
• Results highlight potential targets for interventions aimed at preventing substance use in at-risk youth.