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Updated: Jun 11, 2025
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Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
Published on: November 19, 2012
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Developmental Differences in a Hippocampal-Cingulate Pathway Involved in Learned Safety Following Interpersonal
Sahana Kribakaran1, Stephanie N DeCross2, Paola Odriozola3
1Yale University, New Haven, Connecticut; Yale School of Medicine, New Haven, Connecticut.
Summary
Youth with interpersonal trauma show altered brain activity during safety signal learning (SSL). Despite differences, they successfully learn safety cues, suggesting resilience in fear reduction mechanisms over time.
Area of Science:
- Neuroscience
- Psychology
- Child and Adolescent Psychiatry
Background:
- Interpersonal trauma affects a significant portion of youth, leading to mental health issues.
- Safety signal learning (SSL) is a key mechanism for fear reduction, involving the hippocampus and anterior cingulate cortex.
- Understanding factors influencing psychopathology after trauma is crucial for optimizing interventions.
Purpose of the Study:
- To investigate age-related associations between interpersonal trauma exposure and the neural correlates of SSL in youth.
- To examine how interpersonal trauma impacts hippocampal activation and hippocampus-dorsal anterior cingulate cortex (dACC) connectivity during SSL.
- To explore the role of amygdala activation and connectivity with other cingulate subregions in trauma-exposed youth.
Main Methods:
- Behavioral and functional magnetic resonance imaging (fMRI) data from 102 youth (aged 9-19) with and without interpersonal trauma exposure.
- Analysis of anterior hippocampal activation and anterior hippocampus-dACC functional connectivity during SSL.
- Exploratory analysis of amygdala (CMA, LBA) activation and connectivity with sgACC and rosACC.
Main Results:
- Youth with interpersonal trauma exhibited age-specific patterns of reduced hippocampal activation.
- Heightened centromedial amygdala (CMA) activation was observed in trauma-exposed youth.
- An age-related decrease in hippocampal-sgACC functional connectivity during SSL was found in the trauma group.
- Hippocampal-sgACC connectivity mediated the link between trauma exposure and PTSD symptoms in an age-specific manner.
Conclusions:
- Interpersonal trauma is associated with age- and trauma-specific neural differences in SSL.
- Despite neural alterations, youth with trauma exposure successfully learn conditioned safety cues.
- These findings suggest potential neural pathways contributing to psychopathology but also highlight adaptive learning over time.
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