Prenatal Adversity and Neonatal White Matter Microstructure Independently Relate to Language Outcomes at Age 2 Years

Area of Science:

• Developmental neuroscience
• Pediatric language development
• Neuroimaging

Background:

• Prenatal exposure to adversity can impact neurodevelopment.
• White matter (WM) development is crucial for cognitive and language skills.
• Understanding these links is vital for early intervention strategies.

Purpose of the Study:

• To investigate how prenatal adversity and neonatal white matter (WM) development influence language outcomes at age 2.
• To examine potential mediating and moderating roles of WM in this relationship.

Main Methods:

• Longitudinal study of 160 infants with neonatal diffusion MRI and 2-year language assessments.
• Assessed prenatal social disadvantage (PSD) and maternal psychosocial stress.
• Used regression, mediation, and moderation analyses, controlling for maternal cognition and stimulation.

Main Results:

• Prenatal social disadvantage (PSD) and maternal stress were linked to poorer language outcomes.
• PSD was the primary predictor when both adversities were considered.
• Lower fractional anisotropy (FA) in the neonatal corpus callosum (CC) was independently associated with poorer language outcomes, irrespective of PSD.

Conclusions:

• Prenatal social disadvantage and neonatal corpus callosum (CC) white matter integrity independently predict language outcomes.
• No significant mediating or moderating effects of CC WM were found at this developmental stage.
• Interventions targeting poverty and maternal psychosocial well-being are recommended to support infant WM and language development.