An observational study in Dissociative Identity Disorder (DID), sponsored by Lille University. Recruiting at 4 sites in France. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-06-26.
Sponsored by Lille University · Observational
Dissociative Identity Disorder (DID) is a psychological condition in which a person may feel as though they have multiple distinct personalities or identities. Today, this disorder is being discussed more and more, particularly among young people, partly due to its visibility on social media. However, researchers have observed that some individuals may mimic or exaggerate the symptoms, which makes it more difficult to understand the disorder.
The goal of this study is therefore to better understand:
Participants will complete questionnaires and take part in an interview. The researchers will analyze:
The ultimate goal is to better understand this disorder in order to:
This study falls within the field of dissociative disorders, and more specifically dissociative identity disorder (DID), whose clinical validity and mechanisms remain controversial, particularly due to the reported frequency of feigned symptoms.
Objective The primary objective is to identify the functional determinants of episodes of personality state change, whether genuine or feigned, within the framework of cognitive-behavioral therapies (CBT).
The analysis is based on the SORC functional model:
Participants
N ≈ 60
Participants will complete:
standardized scales:
Lille University is the lead sponsor of 7 studies on the registry; 6 are open to participants now.
Counted across the registry records on this site, refreshed daily.
People who report suffering from Dissociative Identity Disorder (DID).
Exclusion Criteria:
patients diagnosticated with DDI or simulating DDI
Other: Questionnaire and Physical Exam · Other: Interview
the patients' families and loved ones
Other: Questionnaire and Physical Exam · Other: Interview
5 standardized assessment tools measuring, respectively, dissociation (sDIS-Q; Vancappel, Chkili, et al., 2025), beliefs about dissociation (DSB; Vancappel et al., 2023), knowledge and skills related to dissociation (KADS; Vancappel, Chami, et al., 2025), psychotrauma (Ashbaugh et al., 2016), and dissociation simulation.
qualitative interview with the therapist they are already seeing
Dissociative symptoms
Questionnaire
Time frame: baseline
Beliefs about dissociation
Questionnaire
Time frame: baseline
Skills and knowledge regarding dissociation
Questionnaire
Time frame: baseline
Psychotraumatic symptoms
Questionnaire
Time frame: baseline
How the TDI Works
Qualitative interview
Time frame: baseline
Simulation
Qualitative interview
Time frame: baseline
Dissociative symptoms
Qualitative interview
Time frame: baseline
Plan to share: Undecided
No publications or documents are linked to this record.
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
No contact was published for this record. The registry link below has the sponsor’s details.
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Dissociative Identity Disorder
Lille University