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Dopamine and serotonin neurotransmissions exert complementary control over primate approach and avoidance
Lisa Gauthier1,2, Guillaume Drui1,2, Justine Debatisse1,3
1Institut des Sciences Cognitives Marc Jeannerod, UMR 5229, Centre National de la Recherche Scientifique, 69675, Bron Cedex, France.
Translational Psychiatry
|December 29, 2025
Summary
Methylphenidate (MPH) and fluoxetine uniquely improve approach-avoidance behaviors by targeting dopamine and serotonin systems, respectively. These findings suggest distinct, complementary roles for these neurotransmitters in emotional regulation and psychopathology.
Area of Science:
- Neuroscience
- Psychopharmacology
- Behavioral Science
Background:
- Approach-avoidance behaviors are vital for adaptation.
- Dysregulation of these behaviors is linked to psychopathology.
- Dopamine and serotonin roles in these behaviors are not fully understood.
Purpose of the Study:
- To investigate the distinct and complementary roles of dopamine and serotonin in approach-avoidance behaviors.
- To compare the effects of methylphenidate (MPH) and fluoxetine on emotional stimulus processing.
Main Methods:
- Four monkeys performed an approach-avoidance task.
- Acute administration of MPH (dopamine transporter inhibitor) and fluoxetine (serotonin transporter inhibitor).
- Positron Emission Tomography (PET) scans to assess drug binding.
Main Results:
- MPH enhanced reward-based approach behavior, binding to striatal dopamine transporters (DAT).
- Fluoxetine promoted active avoidance of aversive stimuli, binding to serotonin transporters (SERT) in limbic circuits.
- MPH and fluoxetine acted via distinct, complementary mechanisms without direct antagonism.
Conclusions:
- Dopamine and serotonin systems regulate distinct adaptive responses to emotional stimuli independently.
- Findings challenge traditional models pitting dopamine and serotonin against each other.
- Combining MPH and fluoxetine may offer a strategy for targeting specific symptoms in psychopathological disorders.
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