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Related Experiment Video

Updated: May 19, 2026

Comprehensive Profiling of Dopamine Regulation in Substantia Nigra and Ventral Tegmental Area

Comprehensive Profiling of Dopamine Regulation in Substantia Nigra and Ventral Tegmental Area

Published on: August 10, 2012

Striatal dopamine release codes uncertainty in pathological gambling.

Jakob Linnet¹, Kim Mouridsen, Ericka Peterson

¹Research Clinic on Gambling Disorders, Aarhus University Hospital, Nørrebrogade 44, Building 30, DK-8000 Aarhus C, Denmark. linnet@pet.auh.dk

Psychiatry Research

|August 15, 2012

Summary

Pathological gambling is linked to heightened dopamine sensitivity to uncertainty, not reward. This study found an inverse U-shaped dopamine release in gamblers during uncertain tasks, unlike healthy controls.

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Area of Science:

Neuroscience
Psychiatry
Addiction Research

Background:

Pathological gambling may involve hypersensitivity to reward or sustained activation toward uncertainty via midbrain-striatal dopaminergic projections.
The dopamine system differentiates reward and uncertainty signaling, with distinct functional relationships for each.

Purpose of the Study:

To investigate the dopaminergic coding of reward and uncertainty in individuals with pathological gambling compared to healthy controls.
To test hypotheses regarding dopamine release as a linear function of reward or an inverse U-shaped function of uncertainty.

Main Methods:

Positron emission tomography (PET) with [(11)C]raclopride tracer to measure striatal dopamine release.
Iowa Gambling Task (IGT) to assess performance related to reward and uncertainty.
Comparison of dopamine release patterns between 18 pathological gamblers and 16 healthy controls during the IGT.

Main Results:

An inverse U-shaped relationship between striatal dopamine release and IGT performance was observed in the pathological gambling group.
This inverse U-shaped function was not present in the healthy control group.
Data supported dopamine release coding uncertainty, rather than reward, in pathological gambling.

Conclusions:

Striatal dopamine release in pathological gambling is sensitive to uncertainty, exhibiting an inverse U-shaped function.
This heightened sensitivity to uncertainty in dopamine signaling is specific to pathological gamblers and not observed in healthy individuals.
Findings suggest dopamine dysregulation related to uncertainty processing is a key factor in pathological gambling and addictive behaviors.