Summary: Why do we feel compelled to help a stranger in distress? A new UCLA study suggests the answer lies in ancient caregiving circuitry. Researchers found that brain networks originally evolved for parenting are also used to comfort stressed adults, indicating that empathy and prosocial actions are built on the neural machinery of parental care.
Using mice as a model, the team observed activity in the medial preoptic area (MPOA)—a region long associated with parental behavior—when animals encountered distressed adult peers. These results suggest that the neural foundations for helping others did not appear independently, but were adapted from circuits that evolved to protect and care for vulnerable offspring.
Key Facts
- Shared neural origins: The motivation to comfort others and the drive to care for young employ overlapping brain circuitry.
- MPOA as a hub: Neurons in the medial preoptic area are essential for both parental care and comforting stressed peers.
- Reward linkage: Both parenting and helping activate the brain’s dopamine pathways, producing reward signals in the nucleus accumbens.
- Behavioral prediction: Mice that devoted more time to pups were also more likely to console distressed adult companions.
- Clinical relevance: Mapping this circuit provides a potential framework for tackling social withdrawal and empathy deficits in conditions such as depression and autism.
Source: UCLA
Humans and animals are able to detect when others are suffering and often respond with comforting actions. Yet why we are motivated to help, and why that motivation sometimes fails, has been unclear.
UCLA Health researchers investigated this question in a study published in Nature, identifying neural circuits in mice that connect two distinct social behaviors: caring for dependent offspring and consoling distressed adult peers.
These findings provide direct neurobiological support for the longstanding hypothesis that prosocial behavior grew out of neural systems originally specialized for parental care.
Why this matters
Scientists have proposed that prosocial behaviors—actions intended to help or soothe others—may have evolved from brain systems designed for offspring care. Until now, however, the precise brain circuits linking parenting and adult-directed help were not well defined.
By demonstrating a concrete neural connection between parenting and prosocial behaviors, this study offers a new framework for understanding the biological roots of empathy and social motivation. That framework also helps explain why those functions can break down in psychiatric disorders characterized by social withdrawal.
What the study did
The researchers first showed a behavioral link: mice that spent more time caring for pups were also more likely to console stressed adult peers. This association was specific to caregiving tendencies and was not explained by general sociability or unrelated behaviors.
Next, the team recorded neuronal activity and found that neurons in the MPOA—previously known for directing parenting—were activated when animals encountered a distressed adult. Silencing the neurons that were recruited during pup care caused a reduction in consoling behavior toward stressed adults, demonstrating a direct causal link between parenting circuits and prosocial actions.
Finally, investigators traced an MPOA projection to the brain’s dopamine reward system in the ventral tegmental area (VTA) and nucleus accumbens. Both parenting and consoling triggered dopamine release in the nucleus accumbens, indicating that helping others produces intrinsic reward through circuits shared with parental motivation.
What they found
Together, the results indicate that prosocial behavior did not evolve as an entirely new system. Instead, neural systems that originally supported offspring care have been repurposed to support broader social assistance among adults. The MPOA, traditionally labeled as a parenting center, emerges as a broader hub for other-directed care and social support.
What’s next
Future research will explore why some individuals display stronger prosocial tendencies than others and whether disruption in this circuit contributes to social deficits in animal models of neuropsychiatric disorders. The team also aims to test whether restoring activity in this caregiving pathway could serve as a therapeutic strategy to improve social engagement.
From the experts
“We show that the same circuits that enable animals to care for their offspring also drive helping and comforting behaviors toward distressed adults, highlighting a common neural basis that may shape empathy, cooperation and the formation of supportive social communities,” said Weizhe Hong, the study’s senior author and professor in the UCLA Departments of Neurobiology and Biological Chemistry.
Key Questions Answered:
A: In mice, yes. The study found that animals that tended pups more were also more likely to comfort a distressed adult peer. This overlap arises because the brain reuses caregiving circuits to respond to other individuals in need.
A: The parenting circuit connects directly to dopamine reward pathways. Both caregiving and consoling trigger dopamine release in the nucleus accumbens, producing positive reinforcement that makes helping intrinsically rewarding.
A: That is the hope. By pinpointing the circuit that drives empathy and helping, researchers can investigate whether activating or repairing this pathway could reduce social withdrawal in conditions like depression or autism.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional context added by staff for clarity and accuracy.
About this neuroscience and empathy research news
Author: Alana Prisco
Source: UCLA
Contact: Alana Prisco – UCLA
Image: Image credit: Neuroscience News
Original Research: Closed access. “Shared neural substrates of prosocial and parenting behaviors” by Fangmiao Sun, Kayla Y. Lim, James Dang, Li I. Zhang, Ye Emily Wu & Weizhe Hong. Nature. DOI: 10.1038/s41586-026-10327-8
Abstract
Shared neural substrates of prosocial and parenting behaviors
Both humans and animals can detect negative states in others and respond with prosocial behavior to improve their condition. Although prosocial behavior is hypothesized to have evolutionary roots in caregiving for vulnerable offspring, whether parenting-related neural substrates contribute to adult-directed prosocial behaviors has been unclear.
This study shows that mice with higher parenting levels display more prosocial allogrooming toward stressed adults. The medial preoptic area (MPOA), a brain region implicated in parenting, bidirectionally regulates allogrooming directed at stressed conspecifics.
Allogrooming and parenting recruit partially overlapping neuronal ensembles within the MPOA, are both controlled by an MPOA-to-VTA pathway, and are associated with dopamine release in the nucleus accumbens. Activity-dependent labeling demonstrates that MPOA ensembles engaged during parenting are functionally required for allogrooming, and conversely, neurons activated during prosocial behavior are required for pup grooming.
Collectively, these findings reveal a neural circuit mechanism underlying prosocial behavior and identify partially shared substrates between parenting and prosocial behaviors, suggesting that systems evolved for offspring care provided a scaffold for broader social support among adults.