Parenting stress goes beyond depression — it can reshape the brain, study finds

Parenting stress does not end when children leave infancy — a new study shows that raising elementary school-age children can affect the brain well beyond causing depression.

The Korea Brain Research Institute said Wednesday that a research team led by Dr. Jeong Min-young of its cognitive science research group had identified the neurobiological pathway through which parenting stress and depression alter the structure and function of a parent's brain.

While raising children brings parents great joy, it also demands sustained commitment over many years and serves as a persistent source of stress. Previous research has focused largely on perinatal mothers or parents of infants and toddlers. The team turned its attention to primary caregivers — mothers — of school-age children with an average child age of about 9.2 years, a group that has been exposed to the demands of parenting for a prolonged period.

The team conducted an integrated analysis combining detailed psychological assessments with advanced MRI brain imaging data from 167 mothers of school-age children with no psychiatric diagnoses. To objectively evaluate the mothers' emotional states, the researchers used standardized parenting stress inventories, depression scales and anxiety scales to quantify both child-related characteristics and parental psychological burden from multiple angles. They then used MRI to measure brain structure and function, scientifically tracing the neurobiological links through which parenting stress, depression and anxiety ultimately translate into changes in the brain.

The analysis found that mothers with higher levels of depression had a smaller surface area and weaker functional connectivity in the left entorhinal cortex — a region that serves as a gateway for memory and emotional processing — compared with mothers who showed little or no depression. Statistical modeling also revealed that parenting stress does not directly alter the brain; rather, the degree of depression a parent experiences determines how much stress-related change occurs in brain structure and function.

"This study shows that depression acts as the key mediator through which parenting stress drives changes in the brain," Jeong said. "It suggests that early attention to and management of caregiver depression can contribute to the mental well-being not just of the individual parent, but of the entire family."

The findings were published in the Journal of Affective Disorders.