How Obstructed Action Efficacy Impacts Reward-Based Decision Making in Adolescent Depression: An fMRI Study

Area of Science:

• Neuroscience
• Psychiatry
• Developmental Psychology

Background:

• Disrupted reward seeking behavior can lead to negative affect and potentially depression in adolescents.
• Neurocognitive mechanisms linking goal disruption to reward processing in adolescent depression remain unclear.

Purpose of the Study:

• To investigate how incidental action obstruction impacts reward-based decision-making in adolescents.
• To characterize the neurocognitive mechanisms underlying reward processing alterations in adolescent depression.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to assess 62 adolescents with major depressive disorder (MDD) and 68 healthy controls.
• Participants completed a card game task with intermittent blocking of action efficacy in low- and high-stake conditions.

Main Results:

• Adolescents with MDD demonstrated fewer behavioral repetitions when action efficacy was obstructed, particularly in low-stake conditions.
• MDD participants showed increased activation in the ventromedial prefrontal cortex, caudate, and putamen during response repetition.

Conclusions:

• Adolescents with depression exhibit reduced behavioral flexibility when facing blocked actions.
• Abnormalities in neural systems involved in regulating negative affect during reward decision-making are implicated in adolescent depression.