Summary:
A prospective longitudinal study of 1,035 Israeli adults tracked over six months after the October 7 attacks identifies four clear psychological response patterns to mass trauma: resilience (about 54%), natural recovery after severe early distress (about 27%), chronic distress (about 18%), and delayed onset of symptoms (about 2.5%). The research shows that the way symptoms change over time — the distress trajectory — predicts long-term post-traumatic stress disorder (PTSD) risk far better than any single clinical screening. The study also highlights an empathy paradox: high emotional empathy can increase vulnerability to prolonged distress during large-scale collective crises.
Key Facts:
- Four adaptation patterns: Most participants either maintained low distress (resilience) or recovered after an early peak of severe distress (recovery). A substantial minority experienced persistent high distress, and a small group developed symptoms only after a delay.
- Trajectories outperform one-time screens: Repeated measures of distress over six months were stronger predictors of later PTSD symptoms than symptom severity measured at any single time point.
- Empathy as a double-edged sword: While pre-existing volunteering and early positive emotions supported resilience, strong emotional resonance with others’ suffering (empathic distress) correlated with worse outcomes and chronic trajectories.
Source: Hebrew University of Jerusalem / Columbia University
Context: Large-scale terrorist attacks, warfare, and disasters commonly produce widespread psychological strain. Yet people vary dramatically in their responses: many experience brief acute stress that resolves naturally, while others develop lasting, impairing conditions. This study applies a longitudinal, ecological approach to map those different courses following continuous trauma.
Researchers from the Hebrew University of Jerusalem, Columbia University, and Pace University followed a representative sample at three intervals roughly two weeks post-attack, seven weeks later, and six months into the conflict. Their trajectory modeling shows that monitoring symptom dynamics provides more precise identification of who will develop persistent PTSD than routine single-time triage.
Mapping the Four Trajectories
Using longitudinal growth modeling, investigators identified four distinct psychological trajectories over the first six months after the attacks:
- Resilience (≈54%): A majority maintained low levels of distress across all measurement points, showing stable psychological functioning despite ongoing collective stress.
- Recovery (≈27%): Many individuals had high acute distress early on but showed substantial and steady improvement over subsequent weeks and months.
- Chronic Distress (≈18%): A notable minority experienced consistently high distress at each assessment, indicating persistent difficulties requiring clinical attention.
- Delayed Onset (≈2.5%): A small group began with low or mild symptoms that progressively worsened into clinically significant distress over time.
“Early distress does not inevitably signal long-term disorder,” said lead author Dana Katsoty, PhD. “Many people with intense early reactions recovered naturally, while some who appear stable early on later developed serious problems. Repeated measurement allows clinicians and public health systems to distinguish recoverable stress from trajectories that require intervention.”
Trajectory vs. Snapshot: Why Single Screenings Miss the Mark
The team found that an individual’s distress trajectory added significant predictive power for later PTSD symptoms beyond the distress score recorded at six months. In other words, how someone arrived at their final score — the slope and pattern of change — was itself a robust predictor of long-term outcome.
This challenges standard disaster mental health approaches that rely heavily on one-time triage shortly after an event. Single-point screenings risk diverting scarce clinical resources to people who will recover naturally and failing to detect delayed-onset cases whose symptoms emerge later.
Predictors of Resilience and the Empathy Paradox
Investigators examined demographic, psychological, and behavioral predictors of trajectory membership:
- Factors linked to resilience: Older age, male sex, early positive emotions, stronger beliefs that the world is generally safe, and established pre-crisis volunteering habits were associated with resilient trajectories.
- Factors linked to vulnerability: Intense direct exposure to traumatic events and high emotional empathy — an automatic, personal resonance with others’ suffering — were associated with chronic distress and worse trajectories.
The findings draw a distinction between empathic distress, which can overwhelm and increase risk for prolonged suffering, and empathic concern, a more regulated compassion that motivates social support and volunteering. Notably, beginning volunteer work or receiving social support only after the crisis began did not predict better trajectories; long-standing volunteering habits before the trauma were protective, suggesting that pre-existing social and cognitive frameworks support resilience more effectively than reactive coping efforts.
Implications for Public Health and Mass Trauma
As the frequency and scale of mass trauma events rise globally, mental health systems should adopt longitudinal surveillance and targeted intervention strategies. Repeated assessments can prioritize specialized psychiatric care for individuals on chronic or delayed trajectories while avoiding unnecessary treatment for those undergoing natural recovery. This trajectory-informed model supports more efficient, equitable, and evidence-based disaster mental health responses.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional contextual material added by our staff.
About this PTSD Research:
- Media Contact: Danae Marx
- Source: Hebrew University of Jerusalem
- Image Credit: Image credited to Neuroscience News
- Original Research (Open Access): Clinical Psychological Science (Oct 1, 2026). “Psychological-Distress Trajectories and Posttraumatic-Stress-Disorder Symptoms Following Continuous Trauma: Empathy, Positive Emotions, and World Beliefs After the October 7th Attack” Authors: Dana Katsoty, Anthony D. Mancini, and Ariel Knafo-Noam.
- DOI: 10.1177/21677026261479652
Abstract
Psychological-Distress Trajectories and Posttraumatic-Stress-Disorder Symptoms Following Continuous Trauma: Empathy, Positive Emotions, and World Beliefs After the October 7th Attack
In a representative sample of N = 1,035 adults, researchers mapped psychological distress over the first six months after the October 7 attack. Four adjustment patterns emerged: resilience (roughly 54%), recovery from early severe distress (roughly 27%), chronic distress (roughly 14–18%), and delayed onset (around 2.5%).
Trajectory membership predicted PTSD symptom severity beyond final distress levels, underscoring the value of longitudinal monitoring. Predictors of more adaptive outcomes included demographic factors (male gender, older age), lower direct exposure to traumatic events, perceiving the world as safer, and experiencing early positive emotions. Empathic distress correlated with higher distress and worse trajectories, while empathic concern was also linked to volunteering and social support. Overall, the study highlights the importance of ecological, repeated-measures approaches to understanding adaptation to continuous mass trauma.