Multidimensional Inventory of Dissociation (MID) : Clinician Scoring Guide
The MID (Version 6.0) is a comprehensive self-report measure designed to assess pathological dissociation across a wide range of symptoms, experiences, and internal phenomena. Developed by Paul F. Dell, PhD, the MID evaluates both severity and structure of dissociative experiences, including amnesia, depersonalization, derealization, identity alteration, voice hearing, trance states, and other dissociative phenomena commonly seen in trauma-related disorders. It produces 23 primary clinical scales, 10 validity indices, and two global summary scores: DIS-S (Severity of Dissociation) and DIS-T (Trait Dissociation). The MID is one of the most detailed dissociation assessments available and is frequently used in complex trauma, OSDD, and DID evaluations. Interpretation requires clinical expertise.
- Here’s a clean single-sentence version:
- Use at intake for trauma or dissociation evaluations and then every 6–12 months in long-term treatment (with more frequent use only under specialist guidance), as it is not intended for routine or high-frequency symptom tracking.
Foundational Context
The MID was developed as a multidimensional alternative to brief dissociation screeners (e.g., DES), capturing the rich and varied phenomenology of pathological dissociation. Dell’s model conceptualizes dissociation as discrete, semi-autonomous systems of experience, each with distinct thoughts, emotions, bodily states, and sensory experiences. The MID operationalizes this framework through detailed questions covering internal voices, identity fragmentation, intrusions, amnesia, and somatoform dissociation.
Unlike short-form screeners that focus on general dissociative tendencies, the MID is built to map patterns, profiles, and interactions among dissociative symptoms. This makes it well-suited for differentiating among PTSD, OSDD, and DID, where symptom structures, not just severity, are diagnostically meaningful.
What the Assessment Measures
The MID produces information across:
- 23 primary dissociation scales, including:
- Amnesia
- Depersonalization
- Derealization
- Identity Confusion
- Identity Alteration
- Voice Hearing (internal and external)
- Trance/possession-like states
- Somatoform dissociation
- Thought insertion/withdrawal
- Emotional detachment
- Intrusions and internal conflict
- 10 validity and process indices, including:
- Response inconsistency
- Negativity bias
- Over-endorsement patterns
- Random responding indicators
- Summary Metrics
- DIS-S: overall dissociation severity
- DIS-T: trait dissociation profile
Interpretation Guidelines
MID scoring is based on scale averages (0–10) derived from item clusters.
General principles:
- Higher scale values → more intense or more frequent dissociative symptoms
- Interpretation is profile-based, not cutoff-based
- Validity indices must be examined before interpreting clinical scales
- Profiles help differentiate:
- Classic PTSD
- Complex PTSD
- OSDD (Other Specified Dissociative Disorder)
- DID (Dissociative Identity Disorder)
Summary scores:
- DIS-S reflects global dissociation severity
- DIS-T reflects chronic dissociation traits independent of acute state factors
Important caveats:
- The MID does not diagnose disorders
- Interpretation requires specialized training in dissociation and trauma
- Scores must be integrated with clinical interviews and collateral information
Psychometric Properties
Reliability
- High internal consistency across most scales
- Strong reliability of summary scores
- Good stability over repeated administrations
Validity
- Excellent construct validity with trauma-related disorders
- Distinguishes DID, OSDD, and PTSD through pattern analysis
- Strong convergent validity with DES and structured clinical interviews
- Includes multiple validity indices to detect distortions or inconsistent responding
Administration Considerations
- Lengthy (218 items) and best suited for specialized clinics or trauma professionals
- Requires explanation to manage participant fatigue and emotional activation
- May surface distressing internal experiences, appropriate support is important
- Best administered in a safe, stable context with access to clinical support
- Not intended for rapid screening or general mental health settings
- Requires a structured interview (e.g., SCID-D, MID-Interview) for diagnostic follow-up
Limitations
- Length and complexity require significant time and clinician expertise
- Self-report may be influenced by shame, fear, or limited insight
- Some individuals with high dissociation may struggle with consistent reporting
- Not validated for youth populations
- The presence of severe trauma symptoms may amplify item endorsement without reflecting distinct dissociative structure
References
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