This study explores the feasibility, acceptability, and effectiveness of four imagery intervention techniques (metacognitive imagery intervention, imagery rescripting, promoting positive imagery and competing imagery task) for auditory vocal hallucinations using four single case series with an A-B-A within subject design.
Auditory vocal hallucinations (AVHs) are the most common hallucinations of psychosis and do often occur in several other mental disorders. The effects of current standard psychological therapy (cognitive behavioural therapy; CBT) for auditory vocal hallucinations are limited. Thus, there is a need to improve cognitive behavioural therapy for auditory vocal hallucinations. As for many other mental disorders specific treatments have been improved using interventions targeting mental imagery, and recent studies pointed towards an association between psychotic symptoms and mental imagery, adding imagery intervention to CBT might aid this aim. The main objective of this study is to assess the feasibility, acceptability, and effectiveness of four imagery intervention techniques (metacognitive imagery intervention, imagery rescripting, promoting positive imagery and competing imagery task) for auditory vocal hallucinations. The investigators are primarily interested in whether these imagery intervention techniques would be associated with a decrease in auditory vocal hallucinations and imagery symptoms. Also, the investigators are interested in whether these imagery intervention techniques would be a feasible and acceptable intervention for patients with a disorder in the transdiagnostic psychosis and suffering from auditory hallucinations. Secondly, the investigators aim to assess the effects on the level of delusions, visual hallucinations and social and occupational functioning. Lastly, the investigators aim to explore the working mechanisms of imagery, affective symptomatology, and auditory vocal hallucinations by three times daily measuring these symptoms for a period of seven weeks. The investigators hypothesise that 1) all four imagery interventions are associated with a significant decrease in AVHs (e.g., a decline in the level of auditory vocal hallucinations) and imagery characteristics (e.g., decline in imagery frequency, imagery appraisals and imagery quality), whereas no serious adverse side-effects would occur, drop-out rates of therapy are low and patients will give a good qualitative review of therapy. 2) Psychotic symptoms decrease and social and occupational functioning increase after treatment. 3) The severity of emotional imagery is positively associated with the severity AVHs. In addition, the investigators hypothesize that this association may be different for different imagery aspects, with stronger associations between imagery appraisals (i.e., the encapsulated beliefs, and metacognitive beliefs) and the severity of AVHs as compared to other imagery aspects (frequency and quality aspects). And 4) The associations between imagery related factors and the severity of AVHs are mediated by the level of symptoms of anxiety and depression. The primary outcome variables, the level of auditory vocal hallucinations and imagery characteristics, are calculated using daily measurements during a two-week baseline, during the intervention and after the end of intervention at follow-up at 7 weeks. Most secondary outcome variables are assessed using self-report measures before baseline, and at pre- and post-intervention.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
32
The participants receive intervention for a period of 3 weeks, 6 sessions of 60 minutes. In-depth identification of images (2 sessions): Identifying imagery which is related to the auditory vocal hallucinations, constructing a micro-formulation with the participant along the lines of regular Cognitive Behavioural Therapy. In this micro-formulation, first triggers of problematic imagery are identified, both quality and appraisals of this image are identified. Subsequent maladaptive behaviour and possible links with earlier experiences are described, as well as maintaining factors. Imagery intervention (2 sessions): The imagery intervention consists of meta-cognitive imagery rescripting. Consolidation (2 sessions): Relapse prevention strategies are practiced before the end of intervention.
The participants receive intervention for a period of 3 weeks, 6 sessions of 60 minutes. In-depth identification of images (2 sessions): Identifying imagery which is related to the auditory vocal hallucinations, constructing a micro-formulation with the participant along the lines of regular Cognitive Behavioural Therapy. In this micro-formulation, first triggers of problematic imagery are identified, both quality and appraisals of this image are identified. Subsequent maladaptive behaviour and possible links with earlier experiences are described, as well as maintaining factors. Imagery intervention (2 sessions): The imagery intervention consists of imagery rescripting. Consolidation (2 sessions): Relapse prevention strategies are practiced before the end of intervention.
Geestelijke Gezondheidszorg Eindhoven (GGzE)
Eindhoven, North Brabant, Netherlands
Change from baseline level of auditory vocal hallucinations to follow-up at two weeks after end of therapy.
Participants received a text message on their mobile phone with a link to a questionnaire. Participants were asked to fill out the questionnaire immediately after the alert, or, if impossible, the same day. All questions will be preceded with the following sentence: "since the last questionnaire….". The questions about auditory vocal hallucinations are adapted from the auditory vocal hallucination rating scale (AVHRS-Q)
Time frame: Measured three times a day during two weeks of baseline, three weeks of intervention and two weeks of follow-up (an average of 7 weeks)
Change from baseline level of mental imagery characteristics (frequency of imagery, quality of imagery and appraisals of imagery) to follow-up at two weeks after end of therapy.
Participants received a text message on their mobile phone with a link to a questionnaire. Participants were asked to fill out the questionnaire immediately after the alert, or, if impossible, the same day. All questions will be preceded with the following sentence: "since the last questionnaire….". The questions about mental imagery are adapted from the the Dutch Imagery Survey (DimS)
Time frame: Measured three times a day during two weeks of baseline, three weeks of intervention and two weeks of follow-up (an average of 7 weeks)
Treatment safety (change from baseline level of auditory verbal hallucinations to follow-up at the end of therapy).
The investigators consider treatment to be unsafe if the severity of AVHs of more than 50% of the patients is exacerbated. This will be determined on a case-by-case basis. Worsening of the severity of auditory vocal hallucinations is determined by an increase of 25% as measured with the self-report version of the auditory vocal hallucination rating scale (AVHRS-Q).
Time frame: Administered before baseline period of two weeks, immediately after two weeks of baseline, weekly during the intervention of three weeks and immediately after the end of intervention of three weeks
Number of Participants with serious adverse events
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The participants receive intervention for a period of 3 weeks, 6 sessions of 60 minutes. In-depth identification of images (2 sessions): Identifying imagery which is related to the auditory vocal hallucinations, constructing a micro-formulation with the participant along the lines of regular Cognitive Behavioural Therapy. In this micro-formulation, first triggers of problematic imagery are identified, both quality and appraisals of this image are identified. Subsequent maladaptive behaviour and possible links with earlier experiences are described, as well as maintaining factors. Imagery intervention (2 sessions): The imagery intervention consists of promoting positive imagery de novo. Consolidation (2 sessions): Relapse prevention strategies are practiced before the end of intervention.
The participants receive intervention for a period of 3 weeks, 6 sessions of 60 minutes. In-depth identification of images (2 sessions): Identifying imagery which is related to the auditory vocal hallucinations, constructing a micro-formulation with the participant along the lines of regular Cognitive Behavioural Therapy. In this micro-formulation, first triggers of problematic imagery are identified, both quality and appraisals of this image are identified. Subsequent maladaptive behaviour and possible links with earlier experiences are described, as well as maintaining factors. Imagery intervention (2 sessions): The imagery intervention consists of visuospatial working memory tasks. Consolidation (2 sessions): Relapse prevention strategies are practiced before the end of intervention.
The investigators report the total number of (serious) adverse events
Time frame: Administered through study completion, an average of 7 weeks.
Drop-out rate (i.e., number of participants that drop out)
The investigators report drop-outs.
Time frame: Administered through study completion, an average of 7 weeks.
Treatment quality
A retrospective self-report assessment is used to evaluate treatment quality. This assessment is based on the retrospective self-report assessment used in a study of one of the co-investigators to evaluate quality of imagery cognitive therapy for bipolar disorders. This is a 32-item self-report questionnaire. Answers are rated on a 5-point Likert scale (ranging from 1 to 5, higher scores indicates a better outcome).
Time frame: Administered immediately after the end of intervention of three weeks
Change in level of social and occupational function from baseline to follow-up at the end of intervention.
measured with the Social and Occupational Functioning Scale (SOFAS). The SOFAS is used to assess overall functioning in a single score. This scale ranges from 0 to 100 (higher score indicates a better outcome), is a modified version of the Global Assessment of Functioning (GAF) scale, separating the measures of social and occupations function from the measure of symptoms, and psychological functioning.
Time frame: Administered before baseline period of two weeks, immediately after two weeks of baseline, and immediately after the end of intervention of three weeks
The change from baseline (daily) level of delusional/paranoid ideas to follow-up at two weeks after end of therapy.
This is measured with a visual analogue scale (ranging from 0-100, lower score indicates a better outcome) three times a day with the diary item of delusions.
Time frame: Measured three times a day during two weeks of baseline, three weeks of intervention and two weeks of follow-up (an average of 7 weeks)
Change from baseline (daily) level of visual hallucinations to follow-up at two weeks after end of therapy.
This is measured with a visual analogue scale (ranging from 0-100, lower score indicates a better outcome) three times a day with the diary item of visual hallucinations.
Time frame: Measured three times a day during two weeks of baseline, three weeks of intervention and two weeks of follow-up (an average of 7 weeks)
Change from baseline imagery characteristics to follow-up at the end of therapy.
Measured with the Dutch Imagery Survey (DimS). The DimS starts with an elaborate definition of imagery. Thereafter, participants are asked to recall and describe an example of an image that is typical of the imagery they have experienced over the previous two weeks. Since studies on imagery and psychoses showed that patients with psychosis experience imagery in relation to their psychotic symptoms, the investigators ask participants to recall the imagery they have experienced in conjunction to their voices in the last two weeks. Participants are instructed to recall this image and keep this image in mind while answering the subsequent questions regarding imagery. All items of the DimS are rated on a 9-point Likert scale (ranging from 1-9). The internal consistency of all subscales of the DiMS are good (Cronbachs alpha ranging from 0.71 to 0.87), consistency over time is also good.
Time frame: Administered before baseline period of two weeks, immediately after two weeks of baseline, and immediately after the end of intervention of three weeks