Childhood Abuse Timing Shapes Distinct Adult Brain Responses to Emotion

A *Molecular Psychiatry* study examined whether the age at which abuse occurs shapes adult emotion-processing brain activity. Researchers recruited 635 participants, including 236 with reported abuse before age 18 and 399 without. Diagnoses included depression, anxiety, PTSD, and controls. In the scanner, participants viewed faces showing six emotions, presented for 500 ms (conscious) or 10 ms (non-conscious) to separate deliberate from automatic processing.

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A double dissociation by abuse timing emerged. Participants abused before age 13 displayed heightened hippocampal activation during rapid, non-conscious trials, indicating an automatic memory-linked response. Those abused between ages 13-18 exhibited increased amygdala activity only during conscious trials, reflecting heightened threat detection. The signatures remained significant across diagnostic groups and after adjusting for current symptom severity.

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These findings suggest trauma’s neural imprint varies with developmental stage, implying age-specific therapies. Survivors with automatic hippocampal hyperactivity may benefit from interventions targeting implicit responses; those with conscious amygdala hyperactivity may respond to reframe threat appraisal. Mayuresh Korgaonkar, associate professor at the Brain Dynamics Centre, Westmead Institute for Medical Research, University of Sydney, said the timing of abuse “highlights a crucial factor, not merely the presence of abuse.” He urged longitudinal research to confirm timing effects and network-level analyses to inform practice.

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The authors note that reliance on retrospective self-reports may introduce recall bias about abuse timing and severity. The cohort was limited to depression, anxiety, PTSD, and controls, restricting generalizability. Adult-life trauma was not assessed. Gaps include the need for prospective validation of age-specific effects, inclusion of additional psychiatric conditions, and measurement of later-life trauma exposure.

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> “We’ve known for a long time that abuse in childhood raises the risk of mental health problems in adulthood, but far less is understood about how this adverse experience shapes something as fundamental as how we process and react to emotions,” — Mayuresh Korgaonkar, Associate Professor, Brain Dynamics Centre

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> “The most surprising bit was a ‘double dissociation’ that split by age,” — Mayuresh Korgaonkar, Associate Professor

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> “People abused in their teens showed heightened amygdala activity, i.e. the brain’s rapid threat detector, but only during conscious emotion processing when faces were shown long enough to be consciously seen,” — Mayuresh Korgaonkar, Associate Professor

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> “A key next step is confirming these timing effects with more detailed measures of when abuse occurred, ideally in studies that follow people over time rather than relying on recall,” — Mayuresh Korgaonkar, Associate Professor

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Future work will use longitudinal designs, expand to whole-brain connectivity analyses, and test whether the identified neural signatures predict treatment response, moving toward personalized care for survivors of childhood abuse.

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