Researchers at UCLA Health have identified brain circuits in mice that connect parental care with prosocial behaviors, such as comforting stressed peers. The study, published in Nature, provides direct neural evidence supporting the idea that the drive to help others originates from brain systems initially developed for parenting.
According to the researchers, animals displaying more parental behavior also showed greater willingness to comfort other adults in distress. This connection was specific and did not simply reflect general social tendencies or self-focused behaviors.
The team monitored activity in the medial preoptic area (MPOA) of the brain, which is known for its role in parenting. They observed that certain neurons within this region were activated when mice encountered stressed adult companions. When these neurons—previously recruited during interactions with pups—were silenced, the mice’s helping behavior toward distressed adults decreased. This finding demonstrates a direct causal relationship between neural circuits involved in parenting and those supporting prosocial actions.
Additionally, researchers discovered an MPOA pathway projecting to the dopamine reward system of the brain. Both parenting and comforting behaviors triggered dopamine release in the nucleus accumbens, indicating that helping others activates the same reward circuitry as caring for offspring.
The findings suggest that evolution may have adapted existing neural mechanisms for offspring care to enable broader forms of social support among adults. The study proposes a new framework for understanding empathy and social motivation and raises questions about why these processes can be disrupted in conditions such as depression or autism spectrum disorder.
Future work will investigate individual differences in prosocial behavior and whether disruptions in this circuit contribute to social withdrawal seen in neuropsychiatric disorders. Researchers are also considering if restoring activity within this circuit could become a therapeutic target.
"The biological drive to help others may have its origins in the ancient machinery of parental care," according to the UCLA Health research team.
