For decades, the adult brain was considered fixed. New research is proving otherwise. Neuroscientists at the University of California, Santa Barbara have released the first detailed map of the human brain across a single pregnancy. The study reveals that nearly every region of the brain undergoes significant structural remodeling.
Lead researcher Emily Jacobs notes that 97 percent of brain regions examined showed alterations from gestation through postpartum. Total brain volume decreases linearly during pregnancy, partially rebounding after birth. This is not a sign of dysfunction, Jacobs emphasizes, but of neural plasticity. The brain is becoming more efficient for motherhood, similar to changes seen during puberty or menopause.
The Maternal Brain Project has now expanded to 20 participants, including first and second-time mothers, fathers, and non-pregnant women. Over 150 MRI scans and blood draws have been conducted. The same widespread structural changes are being observed across participants, specifically in the superior temporal lobes, prefrontal cortex, and subcortical regions. The team aims to build the world's largest open-access maternal brain database to investigate how fertility treatments, pregnancy complications, or breastfeeding influence this rewiring.