This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: When mothers do not have the necessary resources to raise their children, this adversity causes substantial stress that can hinder caregiving and lead to postpartum depression. In a new study in JNeurosci, Millie Rincón-Cortés and colleagues from the University of Texas at Dallas used rats to explore how a lack of resources while raising pups alters neural activity.
The researchers focused on a neuron population that is activated by interactions with pups and is linked to motivated behavior as well as maternal care. The researchers discovered that when mothers had less bedding to create nests for their pups, this led to increased neuron activity before and during harmful behavior toward the pups. When these moms were separated from their pups, they had less activity in this neuron population compared with mother rats with sufficient nesting resources.
Says Rincón-Cortés, "We predicted these neurons would be changed when mothers were expressing adequate maternal care toward their pups, but that didn't happen. Contrary to our prediction, there was only increased activity right before and during insensitive behavior—it seems to be a maladaptive brain signature." Because this neuron population is involved in general motivation, the researchers also explored whether mothers with fewer nesting resources had altered activity when receiving a food reward. There were no differences in activity compared with mothers with adequate nesting resources, suggesting that changes in activity are specific to the maternal caregiving context.
Elaborates Rincón-Cortés, "Stress and adversity are thought to turn down activity in these cells, but this finding suggests it's not that simple. Context matters; how these neurons respond depends on what the mom is doing." According to the authors, this work reveals how a lack of resources shapes the activity of a neuron population in mother rats to hinder caregiving. The research team has a few planned projects stemming from this work, including using a machine learning approach to identify behaviors that can predict abuse towards pups.
They also are interested in exploring whether government-approved treatments can either prevent this maladaptive brain change from occurring in the rats or reverse altered brain activity following resource scarcity. Ventral Tegmental Area Dopamine Neuron Dynamics During Postpartum Scarcity-Adversity Depend on Caregiving Quality and Pup Proximity, JNeurosci (2026). DOI: 10.1523/JNEUROSCI.0997-26.2026 Journal information: Journal of Neuroscience BSc Life Sciences & Ecology.
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