OVERRIDE is a wellness and psychoeducation tool developed by EMERGENZ Corporation to support first responders and public safety personnel in the United States and Canada.
What OVERRIDE Is
A structured, evidence-informed resource for stress awareness, cognitive reset, and psychological self-support after occupational exposure. Content is based on peer-reviewed research.
What OVERRIDE Is Not
OVERRIDE is not a clinical intervention, mental health treatment, or substitute for professional medical or psychological care. Use of OVERRIDE does not create a therapeutic, clinical, or confidential relationship of any kind.
No Confidentiality
OVERRIDE does not offer confidential communications. Nothing entered or selected is protected by therapist-client privilege. You remain responsible for your own mandatory reporting obligations under applicable law.
Voluntary Use
Use of OVERRIDE is voluntary. No employer, agency, or supervisor has access to your individual session data or responses.
Data & Privacy
OVERRIDE does not collect, store, or transmit personally identifiable information. No data is retained after you close the tool. No cookies are used for tracking.
Do Not Use OVERRIDE If You Are Currently Experiencing
Active thoughts of suicide or self-harm · A psychiatric emergency · Acute intoxication · Symptoms of psychosis or dissociation · A medical emergency. If any of these apply, please use the crisis resources below.
If You Are In Crisis — Support Is Available Now
🇺🇸 United States — 988 Suicide & Crisis Lifeline Call or text 988 · 24/7 · Free · Confidential
Provincial Lines:
🇨🇦 Ontario — Distress Centres of Greater Toronto: 416-408-4357
🇨🇦 British Columbia — Crisis Centre BC: 1-800-784-2433
🇨🇦 Alberta — Mental Health Helpline: 1-877-303-2642
🇨🇦 Quebec (English): 1-866-APPELLE (277-3553)
🇨🇦 Québec (français) — Teléphone-Secours: 1-866-APPELLE (277-3553)
All other provinces: talksuicide.ca/crisis-lines
OVERRIDE is designed for use in the United States and Canada. Users outside these regions should consult locally appropriate resources and clinical standards.
Managing intrusive memories and residual stress after critical incidents. This module explains why calls replay, what the evidence says about reducing intrusion intensity, and gives you grounding techniques to practice.
Learning Objectives
1. Differentiate normal post-incident processing from high-intensity intrusive replay.
2. Summarize the evidence for imagery-competing tasks in reducing intrusive memories.
3. Practice the 5-4-3-2-1 sensory grounding technique and a 30-second hand-contact exercise.
4. Experience a visuospatial distraction task and reflect on its effect.
5. Identify when self-guided techniques are insufficient and professional support is needed.
Time: 30–40 minutes · Credit: · Format: Web module with guided exercises and interactive mini-game
Section 1 of 6
Intrusive Memories
After a critical incident, it's common for parts of the experience to replay involuntarily — an image, a sound, a moment. This is your brain's attempt to integrate something it couldn't fully process in real time.
Not all replay is pathological. There's a spectrum:
Normal Processing
Thinking about the call. Talking it through with a colleague. Reviewing your decisions. The memory is accessible but you control when you engage with it. Intensity decreases over days.
Intrusive Replay
The memory comes to you uninvited — vivid, sensory, often at full emotional intensity. It may be triggered by a sound, a smell, or nothing identifiable. You don't choose to think about it. It pushes in.
Why does immediate debriefing sometimes make it worse? The Cochrane review of psychological debriefing (Rose et al., 2002) found that routine single-session debriefing immediately after a traumatic event does not prevent PTSD and may in some cases increase distress. Memory consolidation is an active process — interrupting it at the wrong moment or in the wrong way can strengthen rather than weaken the emotional trace.
OVERRIDE's design choice: The After Action pathway is intended for use 24–72 hours after an incident, not immediately post-event. This timing is consistent with the evidence on optimal processing windows.
Section 2 of 6
Competing with the Image
Intrusive memories are primarily visuospatial — they replay as images, scenes, and sensory fragments. This gives us a specific intervention target.
The theory: visuospatial working memory has limited capacity. If you occupy it with a competing task (something that requires visual-spatial processing), the intrusive memory has less bandwidth to consolidate at full emotional intensity.
Key Trial
A 2024 randomized controlled trial tested a guided single-session imagery-competing intervention with frontline healthcare workers. The protocol: briefly bring the troubling memory to mind (a "reminder cue"), then immediately play Tetris for several minutes with active mental rotation.
Result: participants receiving the intervention reported significantly fewer intrusive memories at 5 weeks (incidence rate ratio 0.30; 95% CI 0.17–0.53) and lower post-traumatic stress scores. The intervention was brief, repeatable, and scalable — delivered via smartphone.
Kanstrup et al., 2024 — Guided single session RCT reduces intrusive memories in healthcare workers. BMC Medicine.doi:10.1186/s12916-024-03569-8
The mechanism isn't "distraction" in the colloquial sense. It's targeted interference with visuospatial memory reconsolidation. The key elements are: (1) briefly activating the memory, then (2) immediately engaging visuospatial processing to compete with the reconsolidation process.
Important: This is an evidence-based technique for managing intrusive memories, not a treatment for PTSD. If intrusive memories persist, intensify, or are accompanied by avoidance, hyperarousal, or significant impairment, professional support is needed.
Section 3 of 6
Grounding Practice
The 5-4-3-2-1 technique anchors you in the present by systematically engaging each sense. It works because it forces your attention from internal replay to external reality. Practice it now.
5-4-3-2-1 Grounding
Tap "Next" after completing each step. Take your time.
Ready?
You'll move through five senses, from sight to touch.
Hand-Contact Exercise
Place one hand flat on a surface near you — a table, your knee, the arm of a chair. Focus on the temperature and texture for 30 seconds. Notice the pressure of your hand against the surface. This simple tactile anchor interrupts the dissociative quality of intrusive replay by grounding you in physical sensation.
Section 4 of 6
Pattern Match
This is a demonstration of an imagery-competing visuospatial task. The principle: occupy your visual-spatial processing with a task that requires active rotation and matching.
Before playing, briefly bring to mind a mildly troubling image from a recent experience (not your most distressing memory — something moderate). Hold it for 5 seconds. Then play the matching game below for 2–3 minutes.
This is a practice demonstration, not a clinical intervention. The purpose is to experience the mechanism — visuospatial competition — and reflect on whether the image changes in vividness or intensity afterward.
Shape Match
Pairs: 0/8 Time: 120s
Tap two tiles to find matching pairs. Match all 8 pairs before time runs out.
After playing, take a moment to check in: Is the image you brought to mind less vivid? Less emotionally intense? About the same? There's no right answer — just notice.
Section 5 of 6
When to Seek Help
Self-guided techniques have limits. Recognizing those limits is a skill, not a failure.
Seek Professional Support When
→ Intrusive memories persist at high intensity beyond 2–4 weeks
→ You're actively avoiding reminders of the incident (places, people, sounds) in ways that limit your daily life
→ You're emotionally numbing — unable to connect, feel flat, or feel detached from people you care about
→ You're using substances to manage the intrusions
→ You're having thoughts of self-harm
Resilience Evidence
A 2025 systematic review of resilience interventions for disaster rescue workers found that programmes focusing on psychoeducation, stress management, coping strategies, mindfulness, and psychological first aid (1–24 hours) improved resilience and reduced burnout. The key finding: early intervention works, but it must be the right kind at the right time.
Mao et al., 2025 — Resilience interventions for disaster rescue workers: A systematic review.
OVERRIDE surfaces crisis resources (988, First Responder Support Network, SAMHSA, Agency Peer Support, Crisis Text Line) whenever elevated distress indicators are present. These aren't decoration — they're there because the tool is designed to recognize when it's not enough.
Section 6 of 6
Knowledge Check
These questions are for reflection and learning — not assessment. There are no wrong answers recorded. Select the option that best matches your understanding, then read the evidence note.
Self-Reflection
Personal Takeaway
This is private and session-only.
How did the grounding exercise feel?
What technique will you try first after your next difficult call?
Works Cited
References
1
Kanstrup M, et al. A guided single session intervention to reduce intrusive memories of work-related trauma: a randomised controlled trial with healthcare workers in the COVID-19 pandemic. BMC Medicine. 2024. doi:10.1186/s12916-024-03569-8 · BMC Medicine · PubMed
2
Iyadurai L, Visser RM, Lau-Zhu A, et al. Intrusive memories of trauma: a target for research bridging cognitive science and clinical translation. Nat Rev Psychol. 2023;2(3):167–182. doi:10.1038/s44159-023-00150-3 · Nature
3
Rose SC, Bisson J, Churchill R, Wessely S. Psychological debriefing for preventing PTSD. Cochrane Database Syst Rev. 2002;(2):CD000560. Cochrane · PMID 12076399
4
Mao Y, et al. Resilience interventions for disaster rescue workers: A systematic review. 2025. PubMed PMID 40390091
5
Iyadurai L, Blackwell SE, Meiser-Stedman R, et al. Preventing intrusive memories after trauma via a brief intervention involving Tetris computer game play in the emergency department. Mol Psychiatry. 2018;23(3):674–682. doi:10.1038/mp.2017.23 · PMID 28348385
6
National Highway Traffic Safety Administration (NHTSA). National EMS Education Standards. 2021. ems.gov · PDF
Kanstrup M, et al. A guided single session intervention to reduce intrusive memories of work-related trauma: a randomised controlled trial with healthcare workers in the COVID-19 pandemic. BMC Medicine. 2024. doi:10.1186/s12916-024-03569-8 · BMC Medicine · PubMed
2
Iyadurai L, Visser RM, Lau-Zhu A, et al. Intrusive memories of trauma: a target for research bridging cognitive science and clinical translation. Nat Rev Psychol. 2023;2(3):167–182. doi:10.1038/s44159-023-00150-3 · Nature
3
Rose SC, Bisson J, Churchill R, Wessely S. Psychological debriefing for preventing PTSD. Cochrane Database Syst Rev. 2002;(2):CD000560. Cochrane · PMID 12076399
4
Mao Y, et al. Resilience interventions for disaster rescue workers: A systematic review. 2025. PubMed PMID 40390091
5
Iyadurai L, Blackwell SE, Meiser-Stedman R, et al. Preventing intrusive memories after trauma via a brief intervention involving Tetris computer game play in the emergency department. Mol Psychiatry. 2018;23(3):674–682. doi:10.1038/mp.2017.23 · PMID 28348385
National Highway Traffic Safety Administration (NHTSA). National EMS Education Standards. 2021. ems.gov · PDF
✓
Module Complete
You've completed Module 3: After Action. You now understand the science of intrusive memories, have practiced grounding techniques, and experienced a visuospatial competing task.
Standards: Mapped to National EMS Education Standards (2021).
Need immediate support? 🇺🇸 US — Call or text 988 🇨🇦 Canada — Call 1-833-456-4566
Text 45645 (4 PM–midnight ET)
Provincial: ON 416-408-4357 · BC 1-800-784-2433 · AB 1-877-303-2642 · QC 1-866-277-3553
All provinces: talksuicide.ca/crisis-lines