The objective of the study is to identify the phenomenological differences and similarities in characteristics of voices between patients with a dissociative identity disorder and patients with a schizophrenia spectrum disorder with and without a…
ID
Source
Brief title
Condition
- Other condition
- Schizophrenia and other psychotic disorders
Synonym
Health condition
Ook bij psychische stoornissen: dissociatieve stoornissen
Research involving
Sponsors and support
Intervention
Outcome measures
Primary outcome
The primary outcome are the characteristics of the voices.
Secondary outcome
To check suitability for the study and to assign the participant to a group:
- Diagnosis
- Presence/absence of a childhood trauma history
Other:
- Life events
- Psychotic symptoms
- Dissociative symptoms
- Insomnia symptoms
- Characteristics of the voices (via a retrospective questionnaire)
Optional (the participant can decide for himself if he wants to fill out this
questionnaire):
- Trauma content
- Content of most annoying voice
Background summary
The DSM-5 defines schizophrenia spectrum disorders (SSD) and dissociative
disorders as distinct diagnostic categories. However, clinical practice does
not reveal such a clear distinction on a symptom level. The symptom overlap
makes differential diagnosis of SSD and dissociative disorders complex and
causes misdiagnosis. More specifically, voice hearing (VH) is among the most
reported symptoms in SSD and dissociative identity disorders (DID; i.e. one of
the five dissociatieve disorders). The aim of the current study is to identify
the phenomenological differences and similarities in voice characteristics
between patients with trauma-related DID and patients with SSD. Previous
studies found no specific voice characteristic to be exclusive for DID or SSD.
However, for some characteristics differences between the disorders have been
found (e.g. DID patients experience more child voices), while other
characteristics appear to be similarly present in both disorders. Since few
empirical studies have been done on the phenomenological differences and
similarities in voice characteristics between DID and SSD, there is a need for
replication of these results. Furthermore, more clarity is needed about
inconsistent findings between the studies. Additionally, these previous studies
used retrospective measurements while it might be informative to study the
voices in the context and close to the moment they naturally occur. Therefore,
the current study entails a momentary assessment of phenomenological
characteristics of VH via a smartphone-app. Patients with and without a
childhood trauma history will be included, because a (childhood) trauma history
has been suggested to be related to VH in both SSD and DID.
Study objective
The objective of the study is to identify the phenomenological differences and
similarities in characteristics of voices between patients with a dissociative
identity disorder and patients with a schizophrenia spectrum disorder with and
without a childhood trauma history.
Study design
This is a monocentre study with an ecological momentary assessment design.
Study burden and risks
The participant will be asked to visit the research location three times.
During the first visit (the introductory meeting), the participant will receive
extensive information about the study. Spread troughout the two test sessions,
six questionnaires (one of which is optional) and three interviews will be
assessed. The introductory meeting will take a maximum of 60 minutes, the test
sessions will take a maximum of 120 minutes. Besides, the participant will fill
in the momentary assessments, which will be assessed 5 times a day for 10 days
in a row and will take the participant about 50 minutes a day (10 minutes for
each assesment). Filling out the questionnaire about trauma history might cause
some temporary emotional discomfort. The momentary assessments might cause the
participant to become more aware of his voice hearing. However, we do not
expect any ongoing negative effects of participation in the study.
Grote Kruisstraat 2/1
Groningen 9712TS
NL
Grote Kruisstraat 2/1
Groningen 9712TS
NL
Listed location countries
Age
Inclusion criteria
- In order to be eligible to participate in this study, a patient must meet one
of the following criteria:
o A diagnosis of Dissociative Identity Disorder (DID) (300.14)
o A diagnosis of Schizophrenia Spectrum and other Psychotic Disorders (SSD),
more specifically one of the following diagnoses in this category: Brief
Psychotic Disorder (298.8); Schizophreniform Disorder (295.40) or Schizophrenia
(295.90) and persistent voice hearing
- Participants will be divided into groups in terms of their diagnosis and the
presence/absence of a childhood trauma history (based on the outcome of the
Childhood Trauma Questionnaire - Short Form).
o Participants with Dissociative Identity Disorder
o Participants with Schizophrenia Spectrum Disorder with a childhood trauma
history
o Participants with Schizophrenia Spectrum Disorder without a childhood trauma
history
Exclusion criteria
- Severe current substance abuse (e.g., the use of hallucinogens, cannabis,
amphetamine-type stimulants and cocaine) that produces acute drug effects that
are difficult to differentiate from the mental disorders and symptoms involving
this study (e.g., dissociative feelings, hallucinations or paranoid ideation).
- The presence of a substance/medication-induced mental disorder that shares
the phenomenology of schizophrenia spectrum disorders and dissociative
disorders (e.g., cannabis or alcohol induced psychotic disorder).
- Severe brain damage, which prevents the participant from answering the
questions and using the smartphone application properly.
- Lack of fluency in Dutch
- Severity of present disorders (e.g. too much anxiety or paranoid cognitive
distortions), that disables the patient to contribute.
- Patients that meet both the diagnosis of dissociative identity disorder ánd
schizophrenia spectrum disorder (true comorbidity) will be excluded.
- For ethical reasons, patients that are currently in crisis (i.e., immediate
danger to oneself or others) will be excluded (e.g., acute high risk of suicide
or severe self-injurious behavior, or severe aggression-control problems).
Design
Recruitment
Followed up by the following (possibly more current) registration
No registrations found.
Other (possibly less up-to-date) registrations in this register
No registrations found.
In other registers
| Register | ID |
|---|---|
| CCMO | NL74960.042.21 |
| Other | NL9445 (Netherlands Trial Register) |