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Complementary roles of serotonin and dopamine in model-based learning
Masakazu Taira1, Melissa J Sharpe1
1Department of Psychology, University of Sydney, Camperdown, NSW 2006, AUSTRALIA.
Current Opinion in Behavioral Sciences
|January 30, 2026
Summary
Serotonin neurons in the dorsal raphe nucleus (DRN) regulate model-based learning by signaling reward expectations. Dopamine neurons in the ventral tegmental area (VTA) provide teaching signals, complementing serotonin
Area of Science:
- Neuroscience
- Cognitive Science
- Computational Psychiatry
Background:
- Model-based learning relies on mental representations of event relationships.
- Dopamine's role in model-based learning is increasingly understood.
- Serotonin's contribution to these cognitive processes remains less clear.
Purpose of the Study:
- To investigate the role of serotonin neurons in the dorsal raphe nucleus (DRN) in regulating model-based learning.
- To contrast the function of DRN serotonin neurons with ventral tegmental area (VTA) dopamine neurons in this process.
- To propose a framework for how dopamine and serotonin uniquely and complementarily influence model-based learning.
Main Methods:
- Examining the function of DRN serotonin neurons.
- Contrasting their role with VTA dopamine neurons.
- Analyzing neural activity during reward-based learning tasks.
Main Results:
- Phasic firing of VTA dopamine neurons acts as teaching signals for model-based learning.
- Sustained activity in DRN serotonin neurons during reward anticipation reflects precise reward expectation.
- Dopamine and serotonin systems appear to influence model-based learning through distinct but complementary mechanisms.
Conclusions:
- Serotonin neurons in the DRN signal reward expectations, contributing to model-based learning.
- Dopamine neurons in the VTA provide teaching signals, driving learning.
- These distinct systems enable the refinement of cognitive maps by integrating diverse information for enhanced predictive accuracy.
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