Orbitofrontal dysfunction during the reward process in adults with ADHD: An fMRI study.

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder often persisting into adulthood.
• Reward processing deficits are implicated in ADHD, but adult brain activity during decision-making remains understudied.

Purpose of the Study:

• To investigate differences in reward response between adults with ADHD and healthy controls (HCs).
• To utilize functional magnetic resonance imaging (fMRI) to examine brain activation patterns during a decision-making task.

Main Methods:

• Twenty adults with ADHD and 20 HCs completed a modified Iowa Gambling Task (IGT) while undergoing fMRI.
• The IGT assesses reward-related decision-making in scenarios involving risk.

Main Results:

• Adults with ADHD demonstrated poorer performance on the IGT, specifically in avoiding risky choices.
• fMRI revealed significantly lower activation in the orbitofrontal cortex (OFC) in adults with ADHD compared to HCs.
• A positive correlation was observed between IGT performance and OFC activation.

Conclusions:

• Adults with ADHD exhibit abnormal OFC responses during decision-making tasks.
• These findings suggest that reward processing deficits associated with ADHD continue into adulthood.
• This study is the first to use fMRI during the IGT in adults with ADHD, providing novel insights into the neural underpinnings of their condition.