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Altered reward feedback processing in methadone maintenance treatment patients: An ERP study using the monetary
Hua Ni1, Shichen Zhang2, Huiting Cai2
1Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Psychotic Disorders, Shanghai, China; Shanghai Xuhui Mental Health Center, Shanghai, 200030, China.
Summary
Methadone maintenance treatment (MMT) for opioid use disorder (OUD) may alter neural reward processing. MMT patients showed different brain responses to rewards, but methadone did not change these effects acutely.
Area of Science:
- Neuroscience
- Psychiatry
- Addiction Medicine
Background:
- Opioid use disorder (OUD) presents a global health challenge with neurophysiological impacts.
- Methadone maintenance treatment (MMT) is a common OUD therapy, yet its effects on neural reward processing are unclear.
Purpose of the Study:
- To investigate electrophysiological markers of reward processing in MMT patients compared to healthy controls.
- To examine the acute effects of methadone on neural reward processing.
Main Methods:
- Utilized the Monetary Incentive Delay (MID) task with electroencephalography (EEG).
- Compared event-related potentials (FRN and FB-P3) in 15 MMT patients and 21 healthy controls.
- Assessed MMT patients pre- and post-methadone administration.
Main Results:
- No significant differences in behavioral performance (reaction time, accuracy) between groups.
- MMT patients exhibited significantly altered feedback-related negativity (FRN) amplitudes, indicating impaired reward feedback processing.
- No significant differences in feedback P3 (FB-P3) or acute methadone effects on FRN were observed.
Conclusions:
- Stable long-term MMT is associated with altered neural processing of reward feedback.
- Acute methadone administration did not modulate these observed neural alterations.
- Further research is needed to understand the clinical implications of these neural changes in OUD treatment.
