AAIC Day Four 2026 Highlights

Around 80% of women worldwide will become mothers, and pregnancy triggers the largest hormonal shift the body will ever experience. So what does it do to the brain, and does any of it last?

In this episode of XXplored, host Dr Laura Stankeviciute, University of Gothenburg is joined by Dr Magdalena Martínez-García, Scientific Director of Maternal Health at the Ann S. Bowers Women's Brain Health Initiative, University of California Santa Barbara, and Dr Laura Pritschet, an NIH funded postdoctoral scholar at the University of Pennsylvania who leads the Maternal Brain Mapping Project.

They get into the hormonal cascade that drives the whole process, what those widely reported grey matter reductions actually mean, and how one volunteer scanned 26 times from IVF to two years postpartum filled in the gap between before and after. They also take on baby brain, whether repeat pregnancies stack up in the brain, what the UK Biobank data hints at for later life dementia risk, the near total absence of miscarriage and stillbirth from this research, and where postpartum care falls short. Both guests are living through matrescence themselves while studying it, and they talk openly about what that has been like.

Key takeaways

• Pregnancy brings hormone surges into the hundreds and thousandfold, far beyond anything seen across the menstrual cycle, and sensitivity to those shifts matters more than the absolute levels.
• Grey matter reductions across pregnancy are among the most replicable findings in neuroscience, and larger reductions are linked to stronger postpartum bonding rather than damage.
• Follow-up work found some of those changes still present six years after birth, suggesting they may be long-lasting or permanent.
• A second pregnancy produces the same pattern of change but less pronounced, and UK Biobank data suggests a trace of parity in the brain that levels off around four or five births.
• Baby brain gets reframed rather than dismissed: subjective reports are real, objective differences are slight and temporary, and increased cognitive load may carry later advantages.
• Miscarriage, stillbirth and abortion are almost entirely missing from maternal brain research, and both guests believe those women would be among the most motivated participants.
• Research now treats the perinatal period as a neurological transition, but healthcare has not caught up, with a single six week check standing in for what should be ongoing postpartum care.

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A transcript of this show, links and show notes and profile on all our guests are available on our website at https://www.dementiaresearcher.nihr.ac.uk.

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