Adverse Life Experiences and Brain Function: A Meta-Analysis of Functional Magnetic Resonance Imaging Findings.
Level 3 - non-randomized controlled study
Systematic review and coordinate-based meta-analysis of observational fMRI studies
PubMed 37910106 · doi:10.1001/jamanetworkopen.2023.40018
What was done
A systematic review and multilevel kernel density meta-analysis (MKDA) of task-based fMRI studies was conducted across PsycInfo, Medline, EMBASE, and Web of Science through May 2022. Studies evaluating the link between adverse life experiences (e.g., trauma, abuse, maltreatment, poverty) and brain function across four task domains (emotion, memory, inhibitory control, and reward processing) reporting whole-brain coordinates in standard space were included. Peak activation coordinates were extracted by two independent reviewers and synthesized using a random-effects model.
What was found
Across 83 fMRI studies comprising 5,242 participants and 801 coordinates, adversity exposure was significantly associated with higher amygdala reactivity (familywise error rate [FWER] corrected P < .001; x = 22, y = -4, z = -17) and lower prefrontal cortical reactivity (FWER corrected P < .001; x = 10, y = 60, z = 10). These altered corticolimbic responses were detected only in adult cohorts and were most pronounced among individuals exposed to severe threat and trauma.
Why it matters
This meta-analysis demonstrates consistent corticolimbic alterations—namely hyperactive amygdala and hypoactive prefrontal cortex—in adults exposed to adversity, providing a neurobiological mechanism for enduring stress vulnerability and mental health risks.
Limits
The analysis relied on published peak coordinates rather than full statistical parametric maps. Primary studies were observational and cross-sectional, precluding causal inference. Marked heterogeneity existed across adversity types and task paradigms, and findings did not reach significance in pediatric populations.
Cited by
- supports Severe psychological trauma causes lasting changes in brain function.