Summary: Why do we feel compelled to help a stranger in distress? According to a new study, the answer lies in our ancient “parenting machinery.” Researchers discovered that the same brain circuits used to care for vulnerable offspring are hijacked by the brain to drive comforting behavior toward peers.
By monitoring mice, scientists found that the medial preoptic area (MPOA)—long considered the brain’s “parenting hub”—is also activated when animals encounter stressed adults. This suggests that prosocial behavior and empathy didn’t evolve from scratch; they are built on the biological scaffold of parental care.
Key Facts
- Shared Neural Roots: The drive to help and comfort others shares the same neural circuitry as the drive to care for offspring.
- The MPOA Hub: Specific neurons in the medial preoptic area (MPOA) are essential for both parenting and comforting distressed peers.
- The Reward Connection: Both parenting and helping others trigger dopamine release in the brain’s “reward center” (nucleus accumbens), making kindness intrinsically rewarding.
- Predictive Behavior: The study found that mice that are “better parents” (spending more time with pups) are also more likely to comfort stressed adult companions.
- Clinical Implications: Understanding this circuit could offer a new framework for treating psychiatric conditions marked by social withdrawal, such as depression and autism.
Source: UCLA
Humans and animals share a remarkable capacity to sense when others are in distress and respond with comforting behavior. But the motivation for doing so, and why it sometimes breaks down, has been poorly understood.
UCLA Health researchers sought to better understand this in a new study published in Nature that uncovered the brain circuitry in mice linking two seemingly distinct social behaviors: caring for vulnerable offspring and comforting distressed peers.
The findings provide the first direct neural evidence for a long-standing evolutionary hypothesis — that the biological drive to help others may have its origins in the ancient machinery of parental care.
Why it matters
Scientists have long speculated that prosocial behavior, the actions to help and console others, may have evolved from neural systems first developed to support care for helpless offspring. But until now, the specific brain circuits that might link these two behaviors had never been identified.
This study provides concrete neurobiological evidence for that evolutionary connection, and in doing so, offers a new framework for understanding the roots of empathy and social motivation — and why they can be disrupted in conditions such as depression, autism spectrum disorder, and other psychiatric conditions marked by social withdrawal.
What the study did
The study established that animals that are better parents are also better helpers: mice that spent more time caring for pups also spent more time comforting stressed adult companions. This relationship was specific and did not reflect general sociability or other self-directed behavioral tendencies.
By monitoring neural activity, the researchers found that specific neurons in the medial preoptic area (MPOA) — a region known for its role in parenting — were activated when animals encountered stressed adults. They then showed that silencing neurons recruited during pup interactions caused animals to reduce helping behavior toward stressed adults, demonstrating a direct causal link between the circuits supporting parenting and prosocial behavior.
Finally, the team identified an MPOA pathway projecting to the brain’s dopamine reward system that bidirectionally controls both behaviors. Both comforting and parenting triggered dopamine release in the nucleus accumbens, the brain’s “reward center, suggesting that helping others is intrinsically rewarding — and that this reward is mediated by the same circuit that makes parental care motivating.
What they found
Together, these findings support the idea that evolution did not build prosocial behavior from scratch. Instead, the neural systems evolved for offspring care may have provided a scaffold for the emergence of broader prosocial support between adults. The MPOA, once thought of primarily as a parenting center, emerges from this study as a more general hub for other-directed care.
What’s next
Future research aims to understand why some individuals are more prosocial than others. The researchers are also exploring whether disruption of this circuit contributes to the social deficits seen in animal models of neuropsychiatric disorders, and whether restoring its activity could offer a therapeutic target.
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, the answer is yes! This study showed that animals that were more attentive to their pups were also more likely to comfort a distressed adult peer. This is because the brain uses the same “caregiving” circuit for both. When you see someone in pain, your brain essentially activates the same ancient hardware it uses to protect a baby.
A: It’s actually hard-wired. The researchers found that the parenting circuit is directly plugged into the brain’s dopamine reward system. When you help someone, your brain releases a hit of “feel-good” chemicals, just like it does when a parent cares for a child. Helping isn’t just a moral choice; it’s a biological reward.
A: That’s the hope. By identifying the exact circuit that drives empathy and help-seeking, scientists can look for ways to “re-activate” it in conditions like depression or autism where social withdrawal is common. If we can stimulate the “caregiving” hub, we might be able to restore the natural drive to connect and help.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional context added by our staff.
About this neuroscience and empathy research news
Author: Alana Prisco
Source: UCLA
Contact: Alana Prisco – UCLA
Image: The image is credited to 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
Humans and animals can sense the negative states of other individuals and respond with prosocial behaviour to improve their conditions. Although prosocial behaviour is hypothesized to have an evolutionary root in caring for vulnerable newborn offspring, whether the neural substrates underlying parenting may contribute to adult-directed prosocial behaviours remains largely unclear.
We show that mice with higher levels of parenting exhibit more prosocial allogrooming toward stressed adults. The medial preoptic area (MPOA), a brain area involved in parenting behaviour, bidirectionally regulates allogrooming toward stressed conspecifics.
Allogrooming and parenting behaviours recruit a partially overlapping neuronal ensemble in the MPOA, are both controlled by an MPOA–to–VTA pathway and are associated with dopamine release in the nucleus accumbens. Using activity-dependent labeling, we demonstrate that MPOA neuronal ensembles engaged during parenting behaviours are functionally required for allogrooming.
Conversely, MPOA neurons activated during prosocial behaviour are functionally required for pup grooming.
Collectively, these findings uncover a neural circuit mechanism of prosocial behaviour and reveal partially shared neural substrates between parenting and prosocial behaviours, suggesting that the neural systems evolved for offspring care may have provided a scaffold for the emergence of broader prosocial support between adults.
