Severe maternal mental illness alters infant neurodevelopment within the first year of life. New findings identify distinct brain activation patterns in exposed infants, highlighting the critical influence of socioeconomic status on early neural development.
Researchers studied 60 infants aged eight to ten months using functional near-infrared spectroscopy. The cohort included thirty infants exposed to severe maternal mental illness and thirty unexposed controls. Assessments measured neural responses to voice stimuli and emotional prosody.
Exposed infants demonstrated atypical right temporal brain activation. Unlike the control group, these infants showed stronger neural responses to non-voice stimuli than to human voices. This divergence indicates that developmental trajectories shift during a critical period before age one.
Socioeconomic status also proved decisive. Higher status correlated positively with activation to both non-voice stimuli and spoken sentences regardless of emotional tone. Enhanced responses to non-voice stimuli may serve a protective function when social processing is atypical.
The data confirms that maternal mental health and socioeconomic background fundamentally shape infant neurodevelopment. These factors drive distinct neural pathways during the most vulnerable window of early brain formation.