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Adverse rearing environments and neural development in children: the development of frontal electroencephalogram
Katie A McLaughlin1, Nathan A Fox, Charles H Zeanah
1Division of General Pediatrics, Children's Hospital Boston, Harvard Medical School, 300Longwood Avenue, Boston, MA 02115, USA. katie.mclaughlin@childrens.harvard.edu
Insights
Early institutionalization disrupts children's brain development, increasing psychopathology risk. Early foster care interventions can mitigate these effects, promoting healthier frontal electroencephalogram asymmetry trajectories.
Area of Science:
- Neuroscience
- Developmental Psychology
- Child Psychiatry
Background:
- Institutionalized children face severe social and environmental deprivation, potentially impairing brain development and increasing psychopathology risk.
- Frontal cortex hemispheric activation patterns are linked to affective style and internalizing psychopathology.
- Developmental trajectories of frontal electroencephalogram asymmetry in children and the impact of adverse environments were previously uncharacterized.
Purpose of the Study:
- To characterize the development of frontal electroencephalogram asymmetry in children.
- To investigate the impact of institutional rearing on these developmental trajectories.
- To evaluate the effectiveness of foster care intervention in mitigating adverse effects.
Main Methods:
- 136 institutionalized children and 72 community controls (mean age 23 months) were studied.
- Half of institutionalized children were randomized to foster care.
- Electroencephalogram data were collected longitudinally; psychiatric disorders were assessed at 54 months.
Main Results:
- Children showed a developmental shift in frontal activation from right-dominant to left-dominant.
- Institutionalized children had prolonged right-hemisphere activation and blunted left-hemisphere rebound.
- Early foster care (before 24 months) improved trajectories; asymmetry predicted later internalizing symptoms.
Conclusions:
- Adverse rearing environments alter brain development, increasing psychopathology risk.
- Early life interventions are crucial for mitigating long-term negative effects.
- Developmental trajectories of brain asymmetry are sensitive to early environmental exposures.
Background:
Children raised in institutional settings experience marked deprivation in social and environmental stimulation. This deprivation may disrupt brain development in ways that increase risk for psychopathology. Differential hemispheric activation of the frontal cortex is an established biological substrate of affective style that is associated with internalizing psychopathology. Previous research has never characterized the development of frontal electroencephalogram asymmetry in children or evaluated whether adverse rearing environments alter developmental trajectories.
Methods:
A sample of 136 children (mean age = 23 months) residing in institutions in Bucharest, Romania, and a sample of community control subjects (n = 72) participated. Half of institutionalized children were randomized to a foster care intervention. Electroencephalogram data were acquired at study entry and at ages 30, 42, and 96 months. A structured diagnostic interview of psychiatric disorders was completed at 54 months.
Results:
Children exhibited increases in right relative to left hemisphere frontal activation between the second and fourth years of life, followed by an increase in left relative to right hemisphere activation. Children reared in institutions experienced a prolonged period of increased right hemisphere activation and a blunted rebound in left frontal activation. Foster care placement was associated with improved developmental trajectories but only among children placed before 24 months. The development trajectory of frontal electroencephalogram asymmetry in early childhood predicted internalizing symptoms at 54 months.
Conclusions:
Exposure to adverse rearing environments can alter brain development, culminating in heightened risk for psychopathology. Interventions delivered early in life have the greatest potential to mitigate the long-term effects of these environments.
