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1.
Turk Psikiyatri Derg ; 35(3): 248-250, 2024.
Article in English, Turkish | MEDLINE | ID: mdl-39224998

ABSTRACT

Self-mutilation attempts are common in psychiatric practice. One form of self-harm, genital self-mutilation (GSM), is less common but may have severe consequences. GSM acts can occur in different diagnoses such as personality disorders, substance abuse disorders, obsessive-compulsive disorders, and psychotic disorders. When GSM is performed due to psychotic symptoms, the clinical picture is called Klingsor Syndrome. GSM is often associated with severe psychosis and often accompanied by religious delusions. In our article, we discussed a case of schizophrenia with penile autoamputation due to religious delusions. A 28-year-old male patient was admitted to our hospital after penile autoamputation. After surgical interventions, the patient's follow-up continued in our clinic. The patient had auditory hallucinations, delusions of persecution, and sinfulness. His symptoms improved after antipsychotic treatment. It is important to identify the risk factors of Klingsor Syndrome, which is a rare but serious condition, and to intervene early in these patients. Keywords: Self-mutilation, Psychosis, Self-injurious Behavior.


Subject(s)
Self Mutilation , Humans , Male , Adult , Self Mutilation/psychology , Syndrome , Psychotic Disorders/psychology , Delusions/psychology , Diagnosis, Differential , Penis/surgery , Schizophrenia/complications , Self-Injurious Behavior/psychology
2.
PeerJ ; 12: e18026, 2024.
Article in English | MEDLINE | ID: mdl-39285920

ABSTRACT

Background: Delusions in neurocognitive disorder due to Alzheimer's disease (AD) worsen patients' cognitive functions and activities of daily living (ADL), increasing caregiver burden and the risk of mortality. AD patients with delusions tend to experience a more rapid decline in cognition and have demonstrated poorer performance on various cognitive function tests. Considering the prognosis of delusion in AD patients, it tends to be more favorable with appropriate treatment. However, there is a lack of neuropsychological research, specifically examining the impact of delusions in AD, characterized by progressive deterioration of cognitive function. This study investigates the impact of delusions on cognitive function and ADL under conditions controlling for disease severity. Methods: We compared cognitive function and ADL in AD patients aged 65 years or older according to the presence of delusions. To assess longitudinal change, we analyzed data from patients monitored for an average of 15 to 16 months. We assessed cognitive function and ADL using the Seoul Neuropsychological Screening Battery-Second Edition (SNSB-II) and delusions using the Neuropsychiatric Inventory (NPI). We used IBM SPSS Statistics version 25.0 for all statistical analyses. The analysis was not adjusted for multiple comparisons. We investigated how delusions impact cognitive function and ADL, controlling for age, educational level, and disease severity. Results: The delusions group exhibited poorer immediate recall of verbal memory than the non-delusions group. In the follow-up evaluation, patients who developed delusions had lower baseline cognitive function than those who did not, and their language fluency declined over time. In addition, we found the presence of delusions associated with worse functional impairment in ADL as the disease progressed. Conclusion: While controlling for the severity of AD, we found no significant negative impacts of delusions on most cognitive functions. Nevertheless, it is noteworthy that the immediate recall of verbal memory and the Controlled Oral Word Association Test (COWAT)_animal sensitively detected the negative impact of delusions. Furthermore, since delusions are associated with worsening ADL, we understand that delusion treatment is important for improving the quality of life for patients and caregivers.


Subject(s)
Activities of Daily Living , Alzheimer Disease , Delusions , Neuropsychological Tests , Humans , Alzheimer Disease/psychology , Alzheimer Disease/complications , Delusions/etiology , Delusions/psychology , Activities of Daily Living/psychology , Female , Male , Aged , Aged, 80 and over , Cognition/physiology , Neurocognitive Disorders/etiology , Neurocognitive Disorders/psychology , Neurocognitive Disorders/diagnosis , Severity of Illness Index
3.
JAMA Psychiatry ; 81(10): 1039-1046, 2024 Oct 01.
Article in English | MEDLINE | ID: mdl-39110444

ABSTRACT

Importance: Despite growing interest in the phenomenology of delusions in psychosis, at present little is known about their content and evolution over time, including whether delusion themes are consistent across episodes. Objective: To examine the course of delusions and thematic delusion content across relapse episodes in patients presenting to an early intervention service for psychosis. Design, Setting, and Participants: This longitudinal, observational study used clinical data systematically collected from January 2003 to March 2018 from a cohort of consenting patients with affective or nonaffective first-episode psychosis, followed up naturalistically for up to 2 years in an early intervention service for psychosis in Montréal, Quebec, Canada. Data included the thematic content and severity of delusions (scores ≥3 using the Scale for the Assessment of Positive Symptoms) and associated psychotic and nonpsychotic symptoms, both across an initial episode and, in the event of remission, a potential relapse. Data were analyzed from September 2021 to February 2023. Exposure: An early intervention service for psychosis, organized around intensive case management and a multidisciplinary team approach, which observed each patient for up to 2 years of care. Main Outcomes and Measures: The primary outcome was positive symptom relapse and remission, including the presence and content of delusions, which was coded per the Scale for the Assessment of Positive Symptoms and accepted definitions. The main statistical measures included repeated paired-sample t tests and binary logistic regression analyses. Results: Of 636 consenting patients, mean (SD) age was 23.8 (4.75) years; 191 patients were female, 444 were male, and 1 patient was nonbinary. Remission rates were high, and relapse rates were relatively low: 591 individuals had baseline delusions, of which 558 (94.4%) achieved remission. Of these 558 patients, only 182 (32.6%) had a subsequent relapse to a second or later episode of psychosis. Of the 182 patients who did relapse, however, a large proportion (115 [63.2%]) reported threshold-level delusions. Of these 115, 104 patients (90.4%) had thematic delusion content consistent with that reported during the index (first) episode. Those who relapsed with delusions had fewer delusion themes present during subsequent episodes of psychosis compared with the index episode and lower levels of other psychotic and nonpsychotic symptoms. Conclusions and Relevance: Specialized early intervention services for psychosis can achieve high rates of sustained remission. However, in this study, the minority of individuals with delusions who later relapsed experienced similar delusion themes during subsequent episodes. These findings raise important considerations for the conceptualization of delusions and have clinical implications for trajectories of illness and care.


Subject(s)
Delusions , Psychotic Disorders , Recurrence , Humans , Psychotic Disorders/psychology , Male , Delusions/psychology , Female , Adult , Longitudinal Studies , Young Adult , Adolescent , Quebec , Early Medical Intervention
4.
J Alzheimers Dis ; 101(2): 661-670, 2024.
Article in English | MEDLINE | ID: mdl-39213078

ABSTRACT

Background: Delusional ideations, one of neuropsychiatric symptoms (NPSs), are frequently shown in the long-term progression of Alzheimer's disease (AD), and comorbid with other NPSs including depression or agitation. Despite various types of delusional ideations, the comorbidity between each delusional ideation and depressive symptoms has not been discussed. Objective: The present cross-sectional study is aimed at testing the hypothetical mechanism of comorbid pattern in AD. Methods: Among 421 patients with AD, we analyzed the dataset of the Clinical Antipsychotic Trials of Intervention Effectiveness-Alzheimer's Disease to compare age, sex, racial type, Mini-Mental State Examination (MMSE) scores, and Neuropsychiatric Inventory (NPI) depression score of between the presence and absence of each delusional ideation (delusion of persecution, theft, jealousy, abandonment, phantom boarder, Capgras syndrome, misidentification of place, or television sign). Next, with the stratification based on MMSE score of < or > = 15 points, we further explored association between delusional ideation and depressive symptom that was found significances in the primary analysis. Results: Among eight subtypes of delusional ideations, depression score was higher in those with persecution delusion or Capgras syndrome. Moreover, the Capgras syndrome was associated with presence of depression in severer global cognitive impairment status. Conclusions: As comorbid NPSs of delusional ideation in AD, depressive severity is associated with specific delusional subtype: persecution delusion and Capgras syndrome. Capgras syndrome may be attributable to severe cognitive impairment in addition to depressive symptom. The consideration of pathogenetic differences in the distinct delusional ideations may be helpful for clinicians to select the treatment strategy.


Subject(s)
Alzheimer Disease , Delusions , Depression , Humans , Alzheimer Disease/psychology , Alzheimer Disease/complications , Female , Male , Aged , Delusions/psychology , Delusions/epidemiology , Depression/psychology , Depression/epidemiology , Cross-Sectional Studies , Aged, 80 and over , Mental Status and Dementia Tests
5.
Cogn Behav Neurol ; 37(3): 154-164, 2024 Sep 01.
Article in English | MEDLINE | ID: mdl-39087628

ABSTRACT

The clinical features of neuropsychiatric systemic lupus erythematosus (NPSLE) are heterogeneous. Furthermore, therapeutic decision-making for NPSLE depends on the recognition of clinical syndromes that have not been sufficiently studied. This report describes the case of a 36-year-old woman with NPSLE who exhibited severe cognitive dysfunction and affective psychosis with persistent nihilistic delusions such as those described in the Cotard delusion. The patient insisted for several months that she was already dead. CSF analysis showed elevated levels of anti-ribosomal P antibodies and a positive determination of oligoclonal bands. Additionally, 18F -FDG PET/CT imaging revealed severe bilateral frontal hypermetabolism suggestive of brain inflammation and occipital hypometabolism. Results from the Systematic Lupus Erythematosus Disease Activity Index 2000 and the Systemic Lupus Erythematosus Disease Activity Score were consistent with an active state of the immunological disease. We then determined by an algorithm that this neuropsychiatric event could be attributed to the activity of the underlying immunological disease. Despite immunosuppressive and symptomatic treatment, only a partial improvement in cognition was achieved. The psychopathological features of the Cotard delusion remained unchanged 4 months after onset. However, we observed rapid remission of affective psychosis and significant improvement in cognition following electroconvulsive therapy. Subsequent follow-up examinations showed a sustained remission. This case describes a protracted form of the Cotard delusion, the diagnostic challenges that arise in the context of SLE, and treatment dilemmas that necessitate collaboration between neurology, psychiatry, and rheumatology.


Subject(s)
Delusions , Lupus Vasculitis, Central Nervous System , Humans , Female , Adult , Lupus Vasculitis, Central Nervous System/complications , Lupus Vasculitis, Central Nervous System/psychology , Delusions/etiology , Delusions/psychology , Psychotic Disorders/etiology , Psychotic Disorders/complications , Psychotic Disorders/psychology , Psychotic Disorders/immunology , Cognitive Dysfunction/etiology , Cognitive Dysfunction/psychology , Positron Emission Tomography Computed Tomography
6.
Arch Psychiatr Nurs ; 51: 54-61, 2024 08.
Article in English | MEDLINE | ID: mdl-39034095

ABSTRACT

Psychosis-related trauma is a prevalent condition that significantly impacts patients and often leads to an increased reliance on psychiatric nursing services. This study aimed to provide a deeper understanding of the complex relationship between cumulative trauma and the severity of psychosis symptoms among patients experiencing psychosis. Utilizing a cross-sectional research design, data were collected from 76 community-dwelling patients recruited. Patients' sociodemographic and clinical data, Cumulative Trauma Measure scores, and psychosis symptom severity scale scores were collected. A significant difference was observed between collective identity trauma and the presence of hallucinations and abnormal psychomotor behavior (Z = 4.1 and 2.69, respectively). Significant differences were also observed between role identity trauma and the presence of delusions and abnormal psychomotor behavior (Z = 3.86 and 2.06, respectively); attachment trauma and the presence of hallucinations, abnormal psychomotor behavior, and mania (Z = 2.16, 2.12, and 2.11, respectively); and survival trauma and the presence of disorganized speech (Z = 2.61). Moreover, there was a significant difference regarding secondary trauma and the presence of hallucinations, delusions, disorganized speech, abnormal psychomotor behavior, depression, and mania (Z = 4.29, 2.15, 2.11, 2.12, 4.42, and 3.39, respectively). In conclusion, total cumulative trauma explained 44.2 %, 25.8 %, 24.7 %, 16.2 %, 13.6 %, and 13.2 % of the severity of delusion, hallucination, depression, mania, abnormal psychomotor behavior, and disorganized speech, respectively, among patients experiencing psychosis. Implication for nursing practice, by recognizing the nuanced interplay between cumulative trauma and diverse manifestations of psychosis symptoms, nursing professionals can tailor their approaches to provide more holistic and patient-centered care that may significantly contribute to improved patient outcomes and the overall well-being of individuals navigating the complex landscape of psychosis-related trauma.


Subject(s)
Hallucinations , Psychotic Disorders , Severity of Illness Index , Humans , Psychotic Disorders/psychology , Psychotic Disorders/epidemiology , Female , Male , Cross-Sectional Studies , Hallucinations/psychology , Hallucinations/epidemiology , Adult , Delusions/psychology , Psychiatric Status Rating Scales , Middle Aged , Psychiatric Nursing
7.
Ageing Res Rev ; 100: 102431, 2024 Sep.
Article in English | MEDLINE | ID: mdl-39029803

ABSTRACT

INTRODUCTION: Neuropsychiatric symptoms may impact prognosis in individuals with mild cognitive impairment (MCI); however, data on frequency of psychotic symptoms are sparse. METHODS: We searched MEDLINE, EMBASE, PsychoINFO from inception to June 2023. We included studies reporting patients with MCI prevalence of (delusions and/or hallucinations. Random effects model were performed to estimate the prevalence, and subgroup and meta-regression analyses were performed to explore heterogeneity. RESULTS: Of 3145 records identified, 36 studies were included, enrolling 20,426 patients. Overall prevalence of hallucinations was 1.78 % (95 % CI, 1.17 - 2.71) and delusions 3.84 % (95 % CI, 2.71 - 5.42), both with significant heterogeneity (/2 = 90 %). Prevalence of hallucinations and delusions were lower when measured by NPI scales and in population-based samples. DISCUSSION: Delusions and hallucinations occur in MCI patients at low rates. Prevalence can be partially explained by the assessment method, sample source and study heterogeneity.


Subject(s)
Cognitive Dysfunction , Hallucinations , Psychotic Disorders , Humans , Cognitive Dysfunction/complications , Cognitive Dysfunction/epidemiology , Cognitive Dysfunction/psychology , Delusions/complications , Delusions/epidemiology , Delusions/psychology , Hallucinations/complications , Hallucinations/epidemiology , Hallucinations/psychology , Prevalence , Psychotic Disorders/complications , Psychotic Disorders/epidemiology , Psychotic Disorders/psychology
8.
Australas Psychiatry ; 32(5): 467-469, 2024 Oct.
Article in English | MEDLINE | ID: mdl-39079049

ABSTRACT

OBJECTIVE: Many with a bipolar disorder embark on a quest, most commonly during elevated mood states, and sometimes driven by a prescient delusion. This essay draws a parallel with a prominent literary plot - the Quest. METHOD: Reference to the literary plot is made and an exemplar provided, being based on the personal stories of several patients. RESULTS: Parallels between the literary model and the current vignette are emphasized. CONCLUSION: Manic prescience can sometimes be more than a delusion. The Quest is both a literary plot and at times may underlie manic behaviours and even illustrate its symbolic value.


Subject(s)
Bipolar Disorder , Humans , Bipolar Disorder/psychology , Delusions/psychology
9.
Sci Rep ; 14(1): 15809, 2024 07 09.
Article in English | MEDLINE | ID: mdl-38982156

ABSTRACT

One of the most used self-administered instruments to assess persecutory delusions is the Persecutory Ideation Questionnaire (PIQ). Individual differences in PIQ scores are important because they predict the severity of symptoms associated with psychosis-related disorders. The current research demonstrates that PIQ is associated with two new outcomes: Satisfaction with life (Studies 1 and 2) and therapy length needed for hospital discharge (Study 2). Most relevant, we introduce meta-cognitive confidence in one's scale responses as a construct capable of improving the predictive validity of the PIQ. Across two studies, participants from the general population (Study 1) and from a clinical sample (Study 2) completed the PIQ and then reported the confidence in their responses. As expected, the PIQ was associated with satisfaction with life in both cases and duration of therapy required to receive hospital discharge for the clinical sample. Most importantly, confidence further moderated the extent to which the PIQ scores were linked with both outcomes, with greater consistency between the PIQ and the dependent measures obtained for those with higher confidence. Therefore, asking a single item about the confidence associated with responses to the PIQ enhances the association of PIQ scores and relevant consequences across domains.


Subject(s)
Delusions , Humans , Female , Male , Surveys and Questionnaires , Adult , Middle Aged , Delusions/psychology , Psychotic Disorders/psychology , Young Adult , Personal Satisfaction
10.
Cortex ; 177: 194-208, 2024 Aug.
Article in English | MEDLINE | ID: mdl-38875734

ABSTRACT

Postpartum psychosis is a rare but serious condition that can affect women after childbirth. We present a case study of an individual with no comorbidities or psychiatric history who developed postpartum psychosis characterised by prominent misidentification delusions whilst admitted to hospital. The woman recovered quickly with medication and showed no evidence of relapse over the following three years. Whilst still symptomatic and after recovery, the patient was able to provide a detailed description of her experiences. Contemporaneous interviews and observations during her hospital admission and a subsequent detailed retrospective account provide a unique, comprehensive window into her experience of these time-limited delusions. Her case reveals important insights including the triggers for her misidentification delusions, the role of social and contextual influences on delusional beliefs, and her recall of active involvement in evaluating and discarding delusional hypotheses. These insights highlight the complexity of delusional beliefs, challenge existing theories of delusions, and help inform broader theories of belief formation.


Subject(s)
Delusions , Postpartum Period , Psychotic Disorders , Humans , Female , Delusions/psychology , Psychotic Disorders/psychology , Adult , Postpartum Period/psychology , Puerperal Disorders/psychology , Cognition/physiology
11.
Nord J Psychiatry ; 78(6): 548-551, 2024 Aug.
Article in English | MEDLINE | ID: mdl-38905132

ABSTRACT

PURPOSE: The Positive and Negative Syndrome Scale (PANSS) is one of the most commonly used assessment tools for measuring psychotic symptoms. The Psychotic Symptom Rating Scales (PSYRATS) is another instrument created specifically to assess delusions and auditory hallucinations. However, research on the concurrent validity of PSYRATS with PANSS is limited. There are also inconsistent findings regarding the association between the PSYRATS scales and the PANSS positive scale. The present study aims to add to the understanding of the concurrent validity of these measures, while also incorporating a broader measure of psychiatric symptoms (the symptom scale from the Global Assessment of Functioning Scale - split version, GAF-S). MATERIALS AND METHODS: Spearman's Rank Order Correlations (rho) were calculated for scores from the PANSS positive scale, PSYRATS and GAF-S in a sample of 148 participants with psychotic disorders at three time points. RESULTS: The findings indicate concurrent validity between PSYRATS and PANSS, while the PSYRATS scales were not consistently correlated with GAF-S. CONCLUSIONS: PSYRATS may be a valid assessment tool for evaluating psychotic symptoms. The utility of PSYRATS in research and clinical practice should be investigated further.


Subject(s)
Psychiatric Status Rating Scales , Psychometrics , Psychotic Disorders , Humans , Psychotic Disorders/diagnosis , Psychotic Disorders/psychology , Male , Adult , Female , Norway , Reproducibility of Results , Psychiatric Status Rating Scales/standards , Middle Aged , Hallucinations/diagnosis , Hallucinations/psychology , Delusions/diagnosis , Delusions/psychology , Schizophrenia/diagnosis , Young Adult
15.
Brain ; 147(8): 2854-2866, 2024 Aug 01.
Article in English | MEDLINE | ID: mdl-38637303

ABSTRACT

The prediction error account of delusions has had success. However, its explanation of delusions with different contents has been lacking. Persecutory delusions and paranoia are the common unfounded beliefs that others have harmful intentions towards us. Other delusions include believing that one's thoughts or actions are under external control or that events in the world have specific personal meaning. We compare learning in two different cognitive tasks, probabilistic reversal learning and Kamin blocking, that have relationships to paranoid and non-paranoid delusion-like beliefs, respectively. We find that clinical high-risk status alone does not result in different behavioural results in the probabilistic reversal learning task but that an individual's level of paranoia is associated with excessive switching behaviour. During the Kamin blocking task, paranoid individuals learned inappropriately about the blocked cue. However, they also had decreased learning about the control cue, suggesting more general learning impairments. Non-paranoid delusion-like belief conviction (but not paranoia) was associated with aberrant learning about the blocked cue but intact learning about the control cue, suggesting specific impairments in learning related to cue combination. We fit task-specific computational models separately to behavioural data to explore how latent parameters vary within individuals between tasks and how they can explain symptom-specific effects. We find that paranoia is associated with low learning rates in the probabilistic reversal learning task and the blocking task. Non-paranoid delusion-like belief conviction is instead related to parameters controlling the degree and direction of similarity between cue updating during simultaneous cue presentation. These results suggest that paranoia and other delusion-like beliefs involve dissociable deficits in learning and belief updating, which, given the transdiagnostic status of paranoia, might have differential utility in predicting psychosis.


Subject(s)
Delusions , Paranoid Disorders , Humans , Delusions/psychology , Male , Female , Young Adult , Adult , Paranoid Disorders/psychology , Reversal Learning/physiology , Adolescent , Culture , Cues
16.
J Alzheimers Dis ; 99(1): 101-103, 2024.
Article in English | MEDLINE | ID: mdl-38669552

ABSTRACT

The following commentary discusses a review by Cressot et al. entitled: 'Psychosis in Neurodegenerative Dementias: A Systematic Comparative Review'. The authors describe the epidemiology and phenomenology of psychosis across neurodegenerative dementias. Dementia with Lewy bodies had the highest reported prevalence of psychosis at 74% followed by Alzheimer's disease, 54% and frontotemporal degeneration, 42%. Detailed characterization of psychosis shows differences in the types of hallucinations and delusions by dementia type. These findings suggest that different types of dementia related pathology are associated with high rates of psychosis with more specific symptom profiles than previously appreciated. Understanding the differences and variety of psychotic experiences across dementia types may have diagnostic and therapeutic implications for treating hallucinations and delusions in populations suffering from neurodegenerative diseases.


Subject(s)
Dementia , Neurodegenerative Diseases , Psychotic Disorders , Humans , Psychotic Disorders/epidemiology , Psychotic Disorders/psychology , Psychotic Disorders/complications , Neurodegenerative Diseases/epidemiology , Neurodegenerative Diseases/complications , Neurodegenerative Diseases/psychology , Dementia/epidemiology , Dementia/psychology , Lewy Body Disease/complications , Lewy Body Disease/psychology , Lewy Body Disease/epidemiology , Delusions/epidemiology , Delusions/psychology , Delusions/etiology , Hallucinations/epidemiology , Hallucinations/etiology , Alzheimer Disease/epidemiology , Alzheimer Disease/psychology , Alzheimer Disease/complications , Neurobiology
17.
Int J Law Psychiatry ; 94: 101973, 2024.
Article in English | MEDLINE | ID: mdl-38460238

ABSTRACT

A psychotically motivated act or an act committed under impaired insight and control of action in the midst of an acute psychosis is the standard for lack of criminal responsibility. There is now increasing evidence that positive symptoms, particularly in the form of hallucinations and delusions, in trauma-related disorders and borderline personality disorder (BPD) are comparable to positive symptoms in psychotic disorders, posing a challenge for differential diagnosis and forensic assessment of the relevance of positive symptoms to insight and self-control. Due to the indistinguishability of the phenomena, there is both a risk of misdiagnosis of a psychotic disorder and also trivialization with the use of pseudo-hallucinations or quasi-psychotic labels. Essential phenomenological differences that may be helpful in forensic assessments are the usually preserved reality testing in trauma-related disorders and BPD, as well as differences in psychopathological symptom constellations. Because of these differences relevant to forensic assessments, it seems useful to distinguish trauma-related disorders and BPD with positive symptoms from psychotic disorders.


Subject(s)
Borderline Personality Disorder , Dissociative Disorders , Forensic Psychiatry , Psychotic Disorders , Humans , Borderline Personality Disorder/diagnosis , Borderline Personality Disorder/psychology , Dissociative Disorders/psychology , Dissociative Disorders/diagnosis , Psychotic Disorders/psychology , Psychotic Disorders/diagnosis , Diagnosis, Differential , Hallucinations/psychology , Hallucinations/diagnosis , Delusions/psychology , Delusions/diagnosis , Trauma and Stressor Related Disorders/psychology , Trauma and Stressor Related Disorders/diagnosis
18.
Clin Psychol Rev ; 108: 102391, 2024 Mar.
Article in English | MEDLINE | ID: mdl-38301343

ABSTRACT

Cognitive models of psychosis have stimulated empirical studies on cognitive biases involved in schizophrenia spectrum psychoses and their symptoms. This systematic review aimed to summarize the studies on the role of cognitive biases as assessed in different performance-based tasks in schizophrenia spectrum psychoses and clinical high-risk states. We focused on five cognitive biases linked to psychosis, i.e., aberrant salience, attentional biases, source monitoring biases, jumping to conclusions, and bias against disconfirmatory evidence. We identified N = 324 studies published in N = 308 articles fulfilling inclusion criteria. Most studies have been cross-sectional and confirmed that the schizophrenia spectrum psychoses are related to exaggerated cognitive biases compared to healthy controls. On the contrary, less evidence suggests a higher tendency for cognitive biases in the UHR sample. The only exceptions were source monitoring and jumping to conclusions, which were confirmed to be exaggerated in both clinical groups. Hallucinations and delusions were the most frequent symptoms studied in the context of cognitive biases. Based on the findings, we presented a hypothetical model on the role of interactions between cognitive biases or additive effects of biases in shaping the risk of psychosis. Future research is warranted for further development of cognitive models for psychosis.


Subject(s)
Psychotic Disorders , Schizophrenia , Humans , Psychotic Disorders/psychology , Psychotic Disorders/physiopathology , Schizophrenia/physiopathology , Schizophrenic Psychology , Attentional Bias/physiology , Delusions/physiopathology , Delusions/psychology
19.
Behav Cogn Psychother ; 52(3): 262-276, 2024 May.
Article in English | MEDLINE | ID: mdl-38372129

ABSTRACT

BACKGROUND: Daydreaming may contribute to the maintenance of grandiose delusions. Repeated, pleasant and vivid daydreams about the content of grandiose delusions may keep the ideas in mind, elaborate the details, and increase the degree of conviction in the delusion. Pleasant daydreams more generally could contribute to elevated mood, which may influence the delusion content. AIMS: We sought to develop a brief questionnaire, suitable for research and clinical practice, to assess daydreaming and test potential associations with grandiosity. METHOD: 798 patients with psychosis (375 with grandiose delusions) and 4518 non-clinical adults (1788 with high grandiosity) were recruited. Participants completed a daydreaming item pool and measures of grandiosity, time spent thinking about the grandiose belief, and grandiose belief conviction. Factor analysis was used to derive the Qualities of Daydreaming Scale (QuOD) and associations were tested using pairwise correlations and structural equation modelling. RESULTS: The questionnaire had three factors: realism, pleasantness, and frequency of daydreams. The measure was invariant across clinical and non-clinical groups. Internal consistency was good (alpha-ordinals: realism=0.86, pleasantness=0.93, frequency=0.82) as was test-retest reliability (intra-class coefficient=0.75). Daydreaming scores were higher in patients with grandiose delusions than in patients without grandiose delusions or in the non-clinical group. Daydreaming was significantly associated with grandiosity, time spent thinking about the grandiose delusion, and grandiose delusion conviction, explaining 19.1, 7.7 and 5.2% of the variance in the clinical group data, respectively. Similar associations were found in the non-clinical group. CONCLUSIONS: The process of daydreaming may be one target in psychological interventions for grandiose delusions.


Subject(s)
Delusions , Psychotic Disorders , Adult , Humans , Delusions/psychology , Fantasy , Reproducibility of Results , Psychotic Disorders/psychology , Mood Disorders
20.
Cogn Neuropsychiatry ; 29(1): 41-54, 2024 01.
Article in English | MEDLINE | ID: mdl-38305230

ABSTRACT

Introductions: Reduplicative paramnesia (RP) is a rare and poorly understood phenomenon in which a person believes the place they are in has been replicated and exists in two places at once. There is minimal extant theoretical work addressing possible cognitive mechanisms subtending RP.Method: We present a new case of RP and discuss the therapeutic and theoretical implications of this case for the management and understanding of this phenomenon. Using the hypothetico-deductive approach to a neuropsychological case, we examine the phenomenon in the light of one and two-factor approaches to understanding the genesis of delusions.Results: The individual discussed in this case showed some evidence of relatively efficient incorporation of new evidence (belief updating) despite concurrently maintaining a delusional belief system.Conclusion: This case raises novel challenges for the two-factor account of neurological delusions.


Subject(s)
Delusions , Memory Disorders , Humans , Delusions/psychology , Neuropsychological Tests
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