First-time fathers show longitudinal gray matter cortical volume reductions: evidence from two international samples.
Level 3 - non-randomized controlled study
Prospective longitudinal cohort study with a non-randomized comparison group.
PubMed 36057840 · doi:10.1093/cercor/bhac333
What was done
Prospective longitudinal structural MRI study conducted across two cohorts (Spain and California, USA) examining anatomical brain changes before and after the birth of a first child. The study evaluated 20 expectant fathers alongside a control group of 17 childless men (in the Spanish cohort). Primary outcomes were changes in brain cortical volume, cortical thickness, surface area, and subcortical volumes, adjusting for paternal and infant age at the postnatal scan.
What was found
The abstract reports no exact numerical values, effect sizes, or statistical test statistics. It reports overlapping trends of cortical volume reductions within the default mode network and visual networks across both samples of first-time fathers, alongside preservation of subcortical volumes.
Why it matters
Provides evidence that structural neuroplasticity occurs during the transition to parenthood in men, indicating that adult human brain remodeling can be driven by parental experience in the absence of biological pregnancy.
Limits
Small sample size (20 fathers across two sites; control group of 17 men present in only one cohort). The abstract provides no quantitative data or effect sizes. Confounding factors such as sleep deprivation, stress, and specific caregiving hours were not detailed in the abstract.