Screening for Hidden Dissociation Across Your Caseload

How Does Dissociation Develop?

Dissociation is not a character flaw or a quirk. It is a sophisticated survival strategy, typically forged in childhood. Clinical dissociation is strongly linked to severe, repeated childhood abuse — particularly sexual abuse — often beginning before the age of six and involving multiple perpetrators (Kate, Jamieson & Middleton, 2021).

But trauma alone doesn’t tell the full story. Parent-child dynamics are equally predictive. The absence of warmth, consistency, and comfort-seeking safety — not just the presence of abuse — shapes dissociative outcomes. In one striking finding, the single strongest predictor of clinical dissociation in women was the inability to seek comfort from a trusted person when hurt or distressed: a 20-fold increase in odds (Kate, Jamieson & Middleton, 2023).

Dissociation is, at its core, an attachment strategy — a solution to what researchers call “fright without solution”: the impossible bind of needing comfort from the very person who is the source of danger (Main & Hesse, 1990). Understanding this reframes the clinical relationship considerably. A client who seems avoidant, evasive, or unable to engage therapeutically may not be “difficult.” They may be someone for whom closeness has always come with a catch.

The Dissociative Disorders Spectrum

When clinicians think about dissociation, Dissociative Identity Disorder (DID) tends to loom largest in their mind — partly thanks to Hollywood’s enthusiastic, if not always accurate, contributions to public understanding. But DID is the tip of the iceberg.

Dissociative Amnesia involves an inability to recall autobiographical information too extensive to be explained by ordinary forgetfulness — not the “where did I put my keys?” variety, but gaps in identity and life history.

Depersonalization / Derealization Disorder involves persistent or recurrent experiences of feeling detached from one’s own mind, body, or surroundings. Clients might describe feeling like an outside observer of their own life, or that the world looks unreal, dreamlike, or foggy. Importantly, trauma is not always the trigger — drug use (particularly MDMA and ketamine) and acute stress can precipitate onset, often in mid-adolescence.

Partial DID (OSDD-1) is three times more common than DID. In this presentation, one personality state is dominant in daily life, but there are intrusions from other self-states — angry parts, persecutory voices, or dissociative amnesia for traumatic experiences — without those states taking full executive control. Think of them as ghosts rather than fully embodied alternates.

DID itself requires at least two distinct personality states with recurrent amnesia. Contrary to popular depiction, most people with DID do not present with dramatically different wardrobes and accents — the majority show subtle discontinuities that are easy to miss or to attribute to mood variability or “being a complicated person.”

Dissociation Assessment Is Important In Standard Treatment

If you are using CBT, exposure-based therapies, or EMDR without screening for dissociation first, you may be inadvertently worsening your client’s outcomes — or worse, causing harm.

Research shows that individuals with higher levels of dissociation respond less effectively to CBT and have higher dropout rates, because dissociation directly interferes with the cognitive restructuring and emotional integration that CBT depends on (Cloitre et al., 2012; Lanius et al., 2017). In exposure therapy, dissociation impairs the emotional learning and extinction processes that are supposed to make it work (van der Kolk, 2014).

As for EMDR: the greatest number of clinical problems and stories of potential harm involving EMDR concerns clients with dissociative disorders (Shapiro, 2014).

Screening for Dissociation: The MID-60

So, how do you assess for dissociation in practice? The gold standard for screening is the Multidimensional Inventory of Dissociation 60-item version (MID-60) — a psychometrically robust self-report tool derived from Paul Dell’s comprehensive 218-item MID (Kate et al., 2021).

The MID-60 screens across the full spectrum of dissociative presentations — DID, Partial DID / OSDD-1, Dissociative Amnesia, and Depersonalization / Derealization Disorder — using seven dissociation-specific subscales and five co-occurring symptom scales. It is available to clinicians through NovoPsych, where it integrates seamlessly into clinical workflow alongside a comprehensive library of validated psychological assessments.

Crucially, the widely used Dissociative Experiences Scale (DES-II), while familiar, misses 96% of dissociative amnesia cases and 75% of depersonalization cases at its recommended cut-off of ≥30 (Kate et al., 2021). The MID-60 was specifically developed to address these content gaps. Dissociation also explains 32% of the variance in overall disability measured by the WHO Disability Assessment Schedule (WHODAS-2.0) (Hurley et al., 2025) — a statistic that makes a compelling case for making dissociation screening routine.

Clinical Takeaway for Dissociation

If you are working with clients who have a history of complex trauma, you are probably working with dissociation — whether it’s been identified or not. If you are working with clients presenting with anxiety, OCD, depression, ADHD, eating disorders, or neurodivergent profiles, dissociation may be a significant and unaddressed factor in their presentations, their treatment response, and their overall functioning.

The webinar Dissociation in Clinical Practice: Beyond Dissociative Identity Disorder with Dr Mary-Anne Kate addresses exactly this clinical blind spot — walking through the full spectrum of dissociative disorders, the MID-60 screening tool, differential diagnosis challenges (including false-positive DID in younger clients), and how dissociation intersects with the presentations you’re already seeing. It is a sobering, practical, and genuinely important professional development resource for any mental health clinician.