Developmental outcomes of early adverse care on amygdala functional connectivity in nonhuman primates

Area of Science:

• Neuroscience
• Developmental Psychology
• Psychiatry

Background:

• Childhood maltreatment is linked to psychopathology, but neurodevelopmental mechanisms remain unclear.
• Disentangling maltreatment effects from genetic and prenatal factors is challenging.
• The amygdala and its circuits are crucial for stress and emotional regulation during early development.

Purpose of the Study:

• To investigate the longitudinal impact of infant maltreatment on amygdala functional connectivity (FC) in a translational macaque model.
• To examine how adverse early experiences shape the developing brain's emotional circuitry.
• To identify specific neurodevelopmental pathways linking maltreatment to later psychopathology.

Main Methods:

• Utilized a translational macaque model of infant maltreatment.
• Employed longitudinal resting-state functional magnetic resonance imaging (fMRI) from infancy through the juvenile period.
• Conducted region-of-interest (amygdala-prefrontal cortex) and whole-brain FC analyses.

Main Results:

• Observed age-related increases in amygdala FC with various brain regions.
• Found that maltreatment altered amygdala coupling with stress-related regions (locus coeruleus, laterodorsal tegmental area) that emerged with age.
• Maltreated juveniles exhibited weaker amygdala FC with prefrontal cortex regions and stronger bilateral amygdala FC compared to controls, negatively correlating with infant hair cortisol levels.

Conclusions:

• Infant maltreatment significantly impacts the developmental trajectory of amygdala functional connectivity.
• Altered amygdala-PFC connectivity and coupling with stress circuits may underlie behavioral deficits observed after early adversity.
• This study provides crucial insights into the neurodevelopmental consequences of childhood maltreatment.