Newborn amygdala connectivity and early emerging fear

Area of Science:

• Neuroscience
• Developmental Psychology
• Psychiatry

Background:

• Connectivity between the amygdala, insula (Amygdala-aI), and ventral medial prefrontal cortex (Amygdala-vmPFC) is linked to fear and psychiatric disorders.
• The role of newborn amygdala connectivity in the early development of negative emotionality (NE), including fear and sadness, remains unclear.

Purpose of the Study:

• To investigate the relationship between newborn amygdala-insula (Am-Ins) and amygdala-ventral medial prefrontal cortex (Am-vmPFC) resting-state functional connectivity and the developmental trajectories of fear and sadness.
• To determine if these connections predict emotionality at 6 months and changes between 6 and 24 months of age.

Main Methods:

• Utilized resting-state functional connectivity data from newborns.
• Assessed fear and sadness trajectories using the Infant Behavior Questionnaire Revised (IBQ-R) and Early Childhood Behavior Questionnaire (ECBQ) in a cohort of 62 infants.
• Analyzed associations while controlling for maternal sensitivity and depressive symptoms.

Main Results:

• Stronger newborn amygdala connectivity predicted higher fear and sadness at 6 months and less developmental change up to 24 months.
• Amygdala-insula connectivity was specifically associated with fear, whereas amygdala-vmPFC connectivity was associated with sadness.
• These findings were robust, remaining significant after accounting for maternal factors.

Conclusions:

• Individual differences in amygdala connectivity at birth are significant predictors of fear expression throughout the first two years of life.
• Distinct amygdala connectivity pathways are involved in the development of fear versus sadness, highlighting early specificity in emotional processing.
• These findings provide crucial insights into the neurobiological underpinnings of emotional development and potential vulnerability to psychiatric conditions.