Summary: New research shows that dopamine — a neurotransmitter widely known for its role in reward — also contributes to social cognition by helping people recognize emotions from body movement.
Source: SfN
The neurotransmitter dopamine, often linked to reward and motivation, also plays a important role in recognizing emotions, according to a new study published in the Journal of Neuroscience.
People with disorders that disrupt dopamine signaling, such as Parkinson’s disease and schizophrenia, frequently experience difficulties in social cognition, including recognizing emotions in others. Until now, the specific relationship between dopamine and these social processes was unclear, partly because prior studies did not always account for individual differences in baseline dopamine function.
In the study by Schuster et al., healthy adult volunteers completed an emotion recognition task on two separate visits: once after taking 2.5 mg of haloperidol, a dopamine D2 receptor antagonist, and once after taking a placebo. Participants watched short videos of people conveying emotions through dynamic whole-body movement — for example, slow, heavy motions typically associated with sadness and fast, jerky motions associated with anger — and rated the emotions shown.
To estimate each participant’s baseline dopamine function indirectly, the researchers measured working memory performance, an established proxy for individual differences in dopamine. They also assessed temporal processing using movement-based and counting tasks to explore how dopamine might influence emotion recognition through effects on timing and movement.
Results showed that haloperidol’s effect on emotion recognition depended on each person’s baseline dopamine function. Participants with lower baseline dopamine improved in emotion recognition after taking haloperidol, while those with higher baseline dopamine showed impaired emotion recognition under the drug. In other words, the same pharmacological manipulation had opposite behavioral effects depending on individual dopamine-related differences.
Additionally, drug-related changes in emotion recognition were linked to drug effects on movement-based and explicit timing tasks, suggesting that dopamine may influence emotion perception in part through modulation of temporal processing and motor timing. These findings point to a mechanistic route by which dopamine affects social cognition: by altering how people process dynamic timing cues embedded in body movement.
The study emphasizes the importance of accounting for individual baseline dopamine function when investigating neuromodulatory influences on social and cognitive behavior. It also suggests directions for clinical research: future work should examine whether and how dopaminergic changes in clinical populations, such as people with Parkinson’s disease, contribute to difficulties recognizing emotions and interacting socially.
About this dopamine and emotion research news
Author: Calli McMurray
Source: SfN
Contact: Calli McMurray – SfN
Image: The image is in the public domain
Original Research: Closed access. “Dopaminergic modulation of dynamic emotion perception” by B. A. Schuster, S. Sowden, A. J. Rybicki, D. S. Fraser, C. Press, P. Holland and J. L. Cook. Journal of Neuroscience.
Abstract
Dopaminergic modulation of dynamic emotion perception
Emotion recognition from dynamic cues is a fundamental aspect of everyday social interaction. Many clinical populations show impairments in this domain, particularly conditions that involve disruption of the dopamine system, such as Parkinson’s disease. Although prior evidence suggested a link between dopamine and emotion recognition, pharmacological studies in healthy volunteers have produced mixed neural findings and often reported no clear behavioral effects.
This within-subjects study tested how blocking dopamine D2 receptors with haloperidol affects perception of emotion conveyed by whole-body motion, while explicitly accounting for interindividual differences in baseline dopamine function. Thirty-three healthy adults rated emotional point-light walker stimuli after ingesting haloperidol or placebo. Participants also completed motor and timing tasks to probe potential mechanisms.
The study found that haloperidol’s effects on emotion recognition depended on baseline dopamine: individuals with lower baseline dopamine showed improved emotion recognition under haloperidol, whereas those with higher baseline dopamine showed decreased recognition. Drug-induced changes in emotion perception correlated with changes in movement-based and explicit timing measures, implicating temporal processing as a possible mediating pathway.
These results highlight the importance of considering baseline dopamine function in studies of neuromodulation and social cognition. They offer evidence that dopamine influences emotion recognition and suggest temporal processing and motor timing as candidate mechanisms for this effect.
Significance statement
A high prevalence of emotion recognition difficulties in disorders that affect the dopamine system indicates dopamine’s likely involvement in processing social signals. Previous psychopharmacological work in healthy volunteers had been inconclusive. By controlling for baseline dopamine differences and examining timing-related mechanisms, this study reveals that dopamine modulates emotion recognition in healthy individuals and points to temporal processing as a plausible route for this modulation. These insights offer new directions for research into both typical and atypical emotion recognition.