Shadow World Impulsive: 3. Dopamine Hits
Feb 13, 2026
Valerie Voon, a neuropsychiatry professor at Cambridge who studies dopamine and impulse-control, explains how dopamine shapes reward and risk. She breaks down reward prediction and learning. Short, clear takes on why certain drugs can drive risky, compulsive behaviors.
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Early Warnings Were Overlooked
- Reports of abnormal behaviours linked to dopamine agonists surfaced in early 2000s and earlier court cases suggested personality change risks.
- Despite early signals, wide prescribing from the late 1990s meant many patients weren't properly warned years later.
Dopamine Controls Reward And Movement
- Dopamine shapes both movement and reward learning, so drugs that boost it affect behaviour as well as motor symptoms.
- Valerie Voon explains dopamine increases reward sensitivity, risk-taking and preference for immediate gratification.
Treatment Can Shift Decision Biases
- Dopamine agonists relieve Parkinson's motor symptoms by stimulating receptors but can simultaneously alter decision-making.
- Patients become more reward-seeking and less sensitive to negative consequences, increasing risky behaviour.