Dissociation gets less clinical attention in first responder populations than hyperarousal or avoidance, partly because the presentations are more subtle, partly because they’re easier to explain away as stress or fatigue, and partly because the field has historically focused more on the hyperactivation end of the trauma response spectrum.
But dissociation is present in a meaningful subset of first responders, and understanding it matters both for clinical assessment and for treatment planning.
What dissociation actually is
Dissociation is a disruption in the normally integrated functions of consciousness, memory, identity, or perception. It exists on a spectrum. At the mild end: highway hypnosis, losing track of time while doing a routine task, momentarily feeling detached from one’s surroundings. At the severe end: depersonalization, derealization (the world seeming unreal), identity disruption, and dissociative amnesia.
In PTSD, the DSM-5 includes a dissociative subtype, characterized by prominent depersonalization and derealization, that is distinct from the more typical PTSD presentation with dominant hyperarousal features. Research suggests that the dissociative subtype may be more common in people with early-onset trauma, greater trauma severity, and greater adverse childhood experience history.
How dissociation presents in first responders
In clinical settings, first responders with dissociative features often describe: going through shifts on autopilot, feeling like they’re watching themselves from outside, not fully feeling present at home, periods of time that are difficult to account for, and an emotional flatness that’s deeper than numbing, as if the connection between experience and self is intermittent.
The challenge is that autopilot and compartmentalization are also occupationally valued and often described as functional rather than symptomatic. The clinician’s job is to distinguish between adaptive compartmentalization and dissociative detachment, not always straightforward, but clinically important.
Why dissociation matters for treatment
The dissociative subtype of PTSD responds somewhat differently to standard trauma-focused treatments. Research by Resick, Briere, and others has found that exposure-based treatments (Prolonged Exposure, EMDR) need to be modified for people with prominent dissociation — specifically, stabilization and grounding work needs to precede or accompany exposure, because people who dissociate during exposure processing don’t process effectively.
This is one of the reasons why [Mission Reset’s] curriculum includes EMDR grounding as a component, building the stabilization and grounding capacity that allows more intensive trauma processing work to be effective for this population.
Providers assessing first responders should include specific questions about dissociative experiences, the Dissociative Experiences Scale (DES) is a brief, validated screening tool, particularly when presenting clinical complexity that doesn’t fully explain response to standard treatment approaches.