Summary:
A longitudinal study tracking 1,035 adults for six months following the October 7 attacks in Israel identifies four distinct psychological trajectories after mass trauma: resilience (54%), natural recovery (27%), chronic distress (18%), and delayed onset (2.5%). Researchers found that the dynamic trajectory of symptoms over time predicts long-term PTSD risk far more accurately than any single point-in-time clinical assessment, while also revealing that high emotional empathy can increase vulnerability to persistent distress during collective crises.
Key Facts:
- Four Trajectories of Adaptation: Following mass trauma, 81% of participants maintained low distress (54% resilience) or substantially improved after severe initial strain (27% recovery), while 18% experienced chronic distress and 2.5% showed delayed-onset symptoms.
- Trajectory Outperforms Single Snapshots: The longitudinal path of distress over six months predicted post-traumatic stress symptoms significantly better than cross-sectional symptom severity measured at any single point in time.
- The Empathy Paradox: While regular pre-war volunteering and early positive emotions fostered resilience, high emotional empathy, resonance with others’ suffering was associated with higher psychological distress and worse clinical trajectories.
Source: Hebrew University of Jerusalem / Columbia University
Following large-scale terrorist attacks, warfare, or community disasters, psychological strain is nearly universal. Yet individuals exposed to the same traumatic shock respond in profoundly different ways. While many experience transient acute stress that resolves naturally, others develop debilitating, persistent psychological conditions.
A prospective longitudinal study led by researchers at the Hebrew University of Jerusalem, Columbia University, and Pace University demonstrates that psychological adaptation after mass trauma follows distinct, identifiable trajectories.
The findings, tracking 1,035 Israeli adults across three systematic intervals for six months following the October 7 attacks, reveal that tracking how distress evolves over time provides far greater diagnostic accuracy for long-term post-traumatic stress disorder (PTSD) than single-point mental health screenings.
Mapping the Four Trajectories
Using longitudinal trajectory modeling, the research team tracked participants at approximately two weeks post-attack, seven weeks later, and six months into the ongoing conflict. The analysis mapped four distinct psychological courses:
- Resilience (54%): More than half of the cohort maintained consistently low distress throughout the entire six-month duration.
- Recovery (27%): Over a quarter of participants experienced severe acute distress immediately following the trauma but showed substantial, steady psychological recovery over time.
- Chronic Distress (18%): Nearly one in five individuals exhibited unremitting, high-level distress across every assessment point.
- Delayed Onset (2.5%): A small subset began with mild symptoms that steadily worsened into severe distress over subsequent months.
“One of the most important messages from our findings is that early distress does not necessarily mean someone is on a path toward long-term psychological difficulties,” said lead author Dana Katsoty, PhD, of the Hebrew University of Jerusalem and Columbia University. “Many people who initially experienced severe distress recovered over time. At the same time, a single assessment cannot identify everyone who will need support. Following how symptoms change over time allows us to distinguish natural recovery from patterns that may require clinical intervention.”
Trajectory vs. Snapshot: Why Single Screenings Miss the Mark
Crucially, the investigators discovered that a person’s symptom trajectory over time predicted long-term PTSD severity above and beyond their distress level at any single evaluation. Even when controlling for distress scores at the six-month mark, the specific developmental curve of how an individual arrived at that score remained a robust, independent predictor of post-traumatic stress.
This finding challenges standard disaster mental health protocols that rely on one-time triage screenings immediately after an event. Single-snapshot assessments risk overtreating individuals undergoing natural, adaptive recovery while entirely missing delayed-onset cases whose vulnerabilities emerge weeks or months later.
Predictors of Resilience and the Empathy Paradox
The researchers also evaluated demographic, psychological, and behavioral factors that shaped trajectory membership:
- Resilience Drivers: Older age, male sex, experiencing early positive emotions, perceiving the world as fundamentally safe, and maintaining established pre-war volunteering habits strongly predicted resilient trajectories.
- Vulnerability Drivers: Heavy direct exposure to traumatic events and high levels of emotional empathy—the automatic emotional resonance with the pain and suffering of others—strongly correlated with chronic distress.
While empathy is conventionally celebrated as a protective prosocial virtue, the data revealed an emotional cost during acute national crises. Unregulated “empathic distress” absorbed collective suffering without providing psychological protection. In contrast, “empathic concern”, a more regulated, externally oriented compassion, was linked to proactive volunteering, suggesting that empathy can act as both an emotional burden and a social asset during prolonged crises.
Surprisingly, initiating volunteer work or receiving social support after the conflict began did not predict improved trajectories. Only pre-existing, long-standing volunteering habits prior to the crisis conferred protection, suggesting that pre-established cognitive and community frameworks build resilience far more effectively than reactive coping behaviors.
Implications for Public Health and Mass Trauma
As prolonged geopolitical conflicts, natural disasters, and mass casualty events increase globally, the researchers emphasize that mental health infrastructures must shift away from rigid, early single-point screenings.
Implementing repeated, longitudinal tracking allows health systems to conserve specialized psychiatric resources for individuals exhibiting chronic or delayed distress trajectories, ensuring timely interventions for those truly at risk of enduring psychological harm.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional context 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 is 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
Using a large, representative sample (N = 1,035), this study examined trajectories of psychological distress during the first 6 months following the October 7th terrorist attack. Four adjustment patterns were identified: resilience (54.5%), recovery (29.1%), chronic distress (13.9%), and delayed onset (2.5%).
Trajectory membership significantly predicted posttraumatic-stress-disorder (PTSD) symptoms beyond final distress levels, highlighting the value of a longitudinal perspective. Key predictors of more adaptive trajectories included demographic factors (e.g., male gender, older age), level of exposure to the events of the war, world beliefs (e.g., perceiving the world as safe), and early positive emotions.
Empathic distress and empathic concern were associated with distress levels, elevated PTSD symptoms, and more severe trajectories, although empathic concern also related to social support and volunteering. Social support and wartime volunteering were not associated with distress or trajectory membership.
Findings highlight the value of ecological and longitudinal approaches to understanding adaptation during continuous mass trauma.
