Endocannabinoid system alterations in schizophrenia: association with cannabis use and antipsychotic medication.

Determining peripheral modulation of the endocannabinoid system (ECS) may be important for differentiating individuals with schizophrenia. Such differentiation can also be extended to subgroups of individuals, those who use cannabis and antipsychotic medications, particularly those who are treatment resistant. Patients and controls were recruited from the outpatient clinic of the Psychosis Group of the University of São Paulo, Brazil. A final sample of 93 individuals was divided into 3 groups: patients with schizophrenia using clozapine (treatment-resistant) (n = 29), patients with schizophrenia using another antipsychotic (n = 31), and controls (n = 33). By measuring the proteins and metabolites involved in the ECS pathways in the peripheral blood, AEA (anandamide), 2-AG (2-arachidonoyl ethanolamine), and CB2 receptor (peripheral) were quantified. Individuals reporting lifetime cannabis use had lower 2-AG plasma levels (p = 0.011). Regarding the CB2 receptor, the values of patients with schizophrenia and controls were similar, but those of patients using antipsychotics other than clozapine differed (p = 0.022). In generalized linear models to control for confounders, the use of cannabis remained the only factor that significantly influenced 2-AG levels. The relationship for non-clozapine antipsychotics as the only factor related to CB2 changes was marginally significant. We found for the first time that cannabis use and non-clozapine antipsychotic medication are potentially involved in the modulation of the ECS, specifically influencing 2-AG endocannabinoid and CB2 receptor levels. More studies regarding the ECS are needed since it has been increasingly related to the physiopathology of schizophrenia.

Moderating effect of alexithymia between problem gambling and psychotic experiences in university students.

BACKGROUND: Most of the young individuals with problem gambling (PG) or psychotic experiences (PEs) are less prone to seek medical help. Therefore, community-based studies investigating the relationship between these entities in non-clinical young people across a continuum of severity are warranted. To this end, the present study proposes to advance knowledge on the mechanisms that potentially underlie the association between PG and PEs, by examining the role of a potential moderator, i.e. alexithymia, in this relationship. METHODS: A total of 399 participants enrolled in this study (mean age = 21.58 ± 3.20 years) participated in an online cross-sectional survey. The South Oaks Gambling Screen (SOGS), the Prodromal Questionnaire-Brief (PQ-B), and the Toronto alexithymia scale (TAS-20) were used. RESULTS: Thirty-three (8.3%) participants had problem-gambling, whereas 13 (3.3%) were probable pathological gamblers. Moderation analysis results adjusted over confounders (age, household crowding index, marital status, personal history of mental disorder, other illegal drug use) showed that the interaction PG by alexithymia (p = .018) was significantly associated with PEs scores. At moderate (Beta = 1.93) and high (Beta = 3.38) levels of alexithymia, more PG was significantly associated with more PEs scores. CONCLUSION: Findings suggest that GP may have a different impact on PEs depending on the individual's level of alexithymia. As such, both alexithymia and gambling behavior should be considered in the clinical assessment of young people who present with PEs, which can help in implementing more tailored and individualized treatment plans.

Development and initial validation of the cannabis-related psychosis risk literacy scale (CPRL): a multinational psychometric study.

BACKGROUND: Public education efforts to address and reduce potential harms from cannabis use in Arab countries are either slow or inexistent, and do not follow the steadily increasing trends of cannabis use in Arab youth. Several decades of research on substance use, it can be suggested that being aware of, and knowing about, psychosis risk related to cannabis can at least limit the consumption of the substance. Motivated by a lack of measures specifically designed to measure literacy about cannabis-related psychosis risk in younger populations, and based on an extensive literature review, we aimed to create and validate a new self-report scale to assess the construct, the Cannabis-related Psychosis Risk Literacy Scale (CPRL), in the Arabic language. METHOD: A cross-sectional study was carried-out during the period from September 2022 to June 2023, enrolling 1855 university students (mean age of 23.26 ± 4.96, 75.6% females) from three Arab countries (Egypt, Kuwait and Tunisia). RESULTS: Starting from an initial pool of 20 items, both Exploratory Factor Analysis and Confirmatory Factor Analysis suggested that the remaining 8 items loaded into a single factor. The scale demonstrated good internal consistency, with both McDonald omega and Cronbach's alpha values exceeding 0.7 (omega = 0.85 / alpha = 0.85). The CPRL showed measurement invariance across gender and country at the configural, metric, and scalar levels. Concurrent validity of the CPRL was established by correlations with less favourable attitudes towards cannabis (r = -.14; p <.001). In addition, higher literacy levels were found in students who never used cannabis compared to lifetime users (4.18 ± 1.55 vs. 3.44 ± 1.20, t(1853) = 8.152, p <.001). CONCLUSION: The newly developed CPRL scale offers a valid and reliable instrument for assessing and better understanding literacy about cannabis-related psychosis risk among Arabic-speaking young adults. We believe that this new scale is suitable as a screening tool of literacy, as an instrument for measuring the effect of public education interventions aimed at promoting cannabis-related psychosis risk literacy among young people, and as a research tool to facilitate future studies on the topic with a wider application.

The relationship between internet gaming disorder and psychotic experiences: cyberbullying and insomnia severity as mediators.

BACKGROUND: The nature of the relationship between Internet Gaming Disorder (IGD) and psychosis is unclear so far. There is evidence that greater time spent in playing video games may expose players to both insomnia and a toxic online environment with widespread cyberbullying. These two possible consequences of IGD may, in turn, be associated with greater psychotic experiences (PE). Based on this theoretical framework, the present study proposed to contribute the body of the knowledge in this area, by testing the possible indirect effects of insomnia severity, cyber-victimization and cyberbullying in the cross-sectional association between IGD and PE in a sample of Tunisian university students. METHOD: We conducted a cross-sectional study over 4 months (February-May 2022). The Arabic versions of the Brief Symptom Inventory, the Internet Gaming disorder-20 Test, the Insomnia Severity Index, and the Revised Cyber Bullying Inventory-II were administered to a total of 851 students (mean age = 21.26 ± 1.68 years, 53.7% females). RESULTS: We found that 25% of students were at risk of IGD, and 1.8% had an IGD. The results of the mediation analysis showed that insomnia severity fully mediated the association between IGD and paranoid ideation. Higher IGD was significantly associated with more insomnia severity, which was, in turn, significantly associated with more paranoid ideation. Cyberbullying partly mediated the association between IGD and psychoticism. Higher IGD scores were significantly associated with more cyberbullying, which was, in turn, significantly associated with more psychoticism. Finally, greater IGD was significantly and directly associated with higher psychoticism. CONCLUSION: Our findings suggest that insomnia and cyberbullying may be regarded as potential targets for youth mental health promotion, as well as community-focused prevention and early intervention in psychosis. More particular attention should be devoted to the huge potential for engaging in cyberbullying among online gamers. Sleep deprivation should be prevented, assessed and treated in heavy gamers.

Cultural adaptation of the mental health first aid guidelines for depression in Brazil: a Delphi expert consensus study.

BACKGROUND: Depression is a significant contributor to disability in Brazil, with most Brazilians affected by depression receiving no treatment. As the community, including family and friends, plays a crucial role in providing support for someone with depression, it is important that evidence-based resources are available to support people who wish to help. The aim of this study was to culturally adapt the English-language mental health first aid guidelines for assisting a person with depression for the Brazilian culture. METHODS: A Delphi expert consensus study was conducted, with two expert panels; health professionals (n = 29) and people with lived experience of depression (n = 28). One hundred and seventy-four statements from the English-language guidelines were translated into Brazilian Portuguese and administered as a survey. Participants were asked to rate statements based on how appropriate those statements were for the Brazilian culture and to suggest new statements if appropriate. RESULTS: Data were collected over two survey rounds. Consensus was achieved on 143 statements. A total of 133 statements were adopted from the English-language guidelines, whereas 10 new endorsed statements were generated from suggestions of the two expert panels. CONCLUSIONS: There were similarities between the English-language and Brazilian guidelines, mainly related to family involvement and the value of empathy. More research on dissemination and incorporation of the guidelines into the Mental Health First Aid (MHFA) training course for Brazil is required.

Mental illness stigma as a moderator in the relationship between religiosity and help-seeking attitudes among Muslims from 16 Arab countries.

BACKGROUND: Determining the potential barriers responsible for delaying access to care, and elucidating pathways to early intervention should be a priority, especially in Arab countries where mental health resources are limited. To the best of our knowledge, no previous studies have examined the relationship between religiosity, stigma and help-seeking in an Arab Muslim cultural background. Hence, we propose in the present study to test the moderating role of stigma toward mental illness in the relationship between religiosity and help-seeking attitudes among Muslim community people living in different Arab countries. METHOD: The current survey is part of a large-scale multinational collaborative project (StIgma of Mental Problems in Arab CounTries [The IMPACT Project]). We carried-out a web-based cross-sectional, and multi-country study between June and November 2021. The final sample comprised 9782 Arab Muslim participants (mean age 29.67 ± 10.80 years, 77.1% females). RESULTS: Bivariate analyses showed that less stigmatizing attitudes toward mental illness and higher religiosity levels were significantly associated with more favorable help-seeking attitudes. Moderation analyses revealed that the interaction religiosity by mental illness stigma was significantly associated with help-seeking attitudes (Beta = .005; p < .001); at low and moderate levels of stigma, higher religiosity was significantly associated with more favorable help-seeking attitudes. CONCLUSION: Our findings preliminarily suggest that mental illness stigma is a modifiable individual factor that seems to strengthen the direct positive effect of religiosity on help-seeking attitudes. This provides potential insights on possible anti-stigma interventions that might help overcome reluctance to counseling in highly religious Arab Muslim communities.

Cultural adaptation of the guidelines for offering mental health first aid to a person after a potentially traumatic event: a delphi expert consensus study in Brazil.

BACKGROUND: Traumatic events increase the risk of mental disorders. In a country with relatively under-developed mental health support systems, services to assist people who have experienced potentially traumatic events may be unavailable. In such situations, people in the community become key sources of support. However, they do not always have the knowledge and skills to offer effective help. This study reports on the cultural adaptation for Brazil of the English-language mental health first aid guidelines for helping someone who has experienced a potentially traumatic event. METHODS: A Delphi expert consensus study with two expert panels, one comprising health professionals with experience in the treatment of trauma (n = 33) and the other comprising people with lived experience, (n = 29) was conducted. A questionnaire containing 131 statements from the English language guidelines was translated into Brazilian Portuguese. Participants were asked to rate the importance of actions to be taken to help a person who has experienced a potentially traumatic event and to suggest new items where appropriate. RESULTS: Data were collected over two survey rounds. A total of 149 items were included in the final guidelines (110 items from the English-language guidelines and 39 new items created from expert panel comments, in the second round). Immediate action items were endorsed by both panels, while items related to encouraging victims were rejected by the professional panel. The suggested statements mostly related to providing psychological support and attending to the person's subjective experience rather than providing material or structural support. CONCLUSION: While there were many similarities with the English-language guidelines for high-income countries, the guidelines also incorporate actions of importance for Brazil, including the emphasis on the first aider's management of the person's subjective experiences. These guidelines may inform Mental Health First Aid training for Brazil and may also be used as standalone resources.

Cultural adaptation of the mental health first aid guidelines for assisting a person at risk of suicide in Brazil: a Delphi expert consensus study.

BACKGROUND: Suicide is a major public health concern in Brazil, with nearly 115,000 Brazilians dying by suicide in 2010-2019. As support for individuals at risk of suicide may come from the community, particularly family and friends, it is fundamental that evidence-based programs or resources to improve such support are in place when needed. This study aimed to culturally adapt the mental health first aid guidelines for assisting a person at risk of suicide used in English-speaking countries for Brazil. METHODS: A Delphi expert consensus study was conducted among a diverse range of Brazilian health professionals and individuals with lived experience of suicide (n = 60). A total of 161 items from the mental health first aid questionnaire used in English-speaking countries were translated and used in the Brazilian questionnaire. Participants were asked to rate the appropriateness of those items to the Brazilian culture and to recommend any new items when appropriate. RESULTS: Data were collected over two survey rounds. Consensus was achieved on 145 items. While 123 out of 161 items were adopted from the English guidelines, 22 new endorsed items were created from the expert panel comments. CONCLUSIONS: Even though there were similarities among the Brazilian and English-language guidelines, the adapted guidelines incorporated actions that were specific to the Brazilian culture, such as new items emphasising the role of family and friends. Further research is warranted on dissemination and uptake of the guidelines in Brazil as well as research into incorporation of the guidelines into Mental Health First Aid (MHFA) training for Brazil.

Cultural adaptation of the mental health first aid guidelines for Brazilians with problem drinking: a Delphi expert consensus study.

BACKGROUND: Harmful use of alcohol is highly prevalent around the world and results in a large disease burden. Most people who meet the criteria for an alcohol use disorder do not receive treatment. Those in a person's social network can be useful in recognizing a problem and encouraging the person to seek treatment. However, many people lack the knowledge and skills to do this effectively. This study reports on the cultural adaptation for Brazil of the 2009 English-language mental health first aid guidelines for helping someone with problem drinking. METHODS: A Delphi expert consensus study with two expert panels, one comprising health professionals with experience in the treatment of problem drinking and the other comprising people with lived experience was conducted. Participants rated the importance of actions to be taken to help a person with problem drinking. RESULTS: Over two rounds, 60 participants (30 professionals and 30 people with lived experience) rated 197 items. A total of 166 items were included in the final guidelines. CONCLUSIONS: While there were many similarities with the English-language guidelines for high-income countries, the guidelines also incorporate actions of importance for Brazil, including compulsory treatment and different approaches to dealing with people with problem drinking. Further research is necessary to assess their impact.

Cognitive Patterns and Conversion in a Representative Sample of Individuals at Risk for Psychosis.

ABSTRACT: Clinical high-risk (CHR) individuals belong to a heterogeneous group, of which only a few will cross the threshold for a clinical diagnosis. Cognitive disturbances are present in CHR subjects and may be indicative of transition. Our study aims to identify such deficits in a representative CHR for psychosis sample. Our sample comprised 92 CHR individuals and 54 controls from a representative cohort of the general population. They were followed up for a mean of 2.5 years, with 15 individuals converting to schizophrenia or other Diagnostic and Statistical Manual of Mental Disorders, 5th Edition diagnoses. Neurocognitive assessment was performed with the University of Pennsylvania Computerized Neuropsychological Testing, and CHR status was assessed with the Structured Interview for Prodromal Syndromes (SIPS). Baseline scores were entered in a latent profile analysis model. Our study brought forward a four-class model on cognitive performance. One class displayed better performance, whereas the other three performed worse, all compared with controls. The class with lower executive function also had the highest score on disorganized communication (SIPS P5 = 1.36, p < 0.05), although unrelated to conversion. Among the low performers, the class significantly related to conversion (p = 0.023) had the highest score in decreased expression of emotion (SIPS N3 = 0.85, p < 0.05). Our study brings new and relevant data on non-help-seeking CHR individuals and the relationship between cognitive patterns and conversion. We have highlighted a specific cognitive signature, associated with negative symptoms, which represents a stable trait with presumed lower conversion to a psychiatric illness.

Ninety Years of Multiple Psychotic-Like and Spiritual Experiences in a Doctor Honoris Causa: A Case Report and Literature Review.

ABSTRACT: Psychotic experiences are common experiences shared by a considerable part of the world's population. Moreover, most of the individuals who report these experiences also report those called spiritual and dissociative phenomena. In specific culture and religious backgrounds, these experiences are frequently seen as a part of normal human experiences, usually called mediumship. We report a case of a famous Brazilian medium with 90 years of experiencing psychotic-like, dissociative and/or spiritual experiences, but coped well with the experiences and never sought psychiatric or psychological assistance. The medium received several honorific prizes, such as doctor honoris causa from different institutions, published more than 200 books, and ran a nonprofit organization that takes care of 5000 people daily. Finally, we review the literature on this topic and stress the urge for more research aiming to distinguish pathological and nonpathological psychotic experiences to avoid overmedicalization and iatrogenic treatments.

Relationship Between Symptomatic Dimensions and Global Functioning of Non-Help-Seeking Individuals at Risk for Psychosis.

This study aims to analyze the relationship between the symptomatic dimensions of psychosis and functioning of individuals at risk for psychosis (ultrahigh risk [UHR]) in a non-help-seeking UHR sample from the general population. The sample is the same as the one used in the Brazilian Subclinical Symptoms and Prodromal Psychosis cohort study. We applied questionnaires of functioning (Global Assessment of Functioning Scale) and symptomatic dimensions (Scale of Prodromal Symptoms). Next, we correlated the symptomatic dimensions with functioning. We found a significant relationship between avolition and uncommon thought content with poor functioning, whereas the remaining symptoms were not as relevant. Poor functioning was most related to avolition, a negative symptom, followed by unusual thought content, a positive symptom.

Ultra-high risk for psychosis stigma: an updated Systematic Review.

OBJECTIVE: To clarify if stigma associated with schizophrenia has also been directed towards the ultra-high risk for psychosis (UHR) population, the present review aimed at synthetizing the existing literature to update and extend our understanding on the topic. METHODS: A systematic PRISMA-compliant review was performed in PubMed, Embase, Cochrane and Web of Science for articles published until 30/04/2023, using a combination of search terms describing the at-risk mental states for psychosis and stigma and correlated terms. RESULTS: Thirty-eight studies were included. Twenty-nine addressed UHR individuals directly, and 9 conducted interviews with non-patients regarding UHR. A total of 2560 UHR individuals were assessed; mean sample size was of 88.3 participants. Most of the studies were quantitative non-randomized/observational with young adults, 71.4% used SIPS (Structured Interview for Psychosis-risk Syndromes) and 25.0% used CAARMS (Comprehensive Assessment of At-Risk Mental States). Overall, the summarized studies have mainly involved individuals already attending UHR clinics from Western and high income countries. Studies can be grouped into five forms of stigma, among which the most frequently explored was perceived public stigma, followed by public stigma, self-stigma/internalized stigma, stigma stress and associative stigma. The main study design was quantitative nonrandomized, with only one interventional study. Most of the results confirmed the presence of stigma toward UHR individuals and findings provide additional support to the fact that stigma seems to be present since the very early stages of the disease. CONCLUSION: There is still a paucity of research and knowledge gaps about UHR-related stigma. Nevertheless, results suggest the presence of stigma toward UHR individuals, supporting the fact that stigma is present since the early stages of psychosis.

How "global" is research in early intervention for psychosis? A bibliometric analysis.

INTRODUCTION: Unlike high-income countries (HICs), there are few early intervention services for psychosis in low-and middle-income countries (LAMICs). In HICs, research spurred the growth of such services. Little is known about the state of EIP research in LAMICs, which we address by examining their research output and collaborations vis-à-vis that of HICs. METHODS: We conducted a search in Scopus database for early psychosis publications in scientific journals since 1980. Data from each record, including title, author affiliation, and date, were downloaded. For HIC-LAMIC collaborations, data on first, corresponding and last authors' affiliations, and funding were manually extracted. Descriptive statistics and social network analysis were conducted. RESULTS: Globally, early psychosis publications increased from 24 in 1980 to 1297 in 2022. Of 16,942 included publications, 16.1 % had LAMIC authors. 71.3 % involved authors from a single country (regardless of income level). 21.9 % were collaborations between HICs, 6.6 % between HICs and LAMICs, and 0.2 % among LAMICs. For research conducted in LAMICs and involving HIC-LAMIC collaborations, the first, last, and corresponding authors were LAMIC-based in 71.8 %, 60.7 %, and 63.0 %, respectively. These positions were dominated (80 %) by authors from four LAMICs. 29.4 % of the HIC-LAMIC subset was funded solely by LAMIC funders, predominantly two LAMICs. CONCLUSIONS: LAMICs are starkly underrepresented in the otherwise flourishing body of early psychosis research. They have far fewer collaborations and less funding than HICs. Closing these gaps in LAMICs where most of the world's youth live is imperative to generate the local knowledge needed to strengthen early psychosis services that are known to improve outcomes.

Development of mental health first aid guidelines for psychosis for Brazil: A Delphi expert consensus study.

Psychotic symptoms can be highly debilitating for those experiencing them. Community members, including family and friends, can play a crucial role in providing support to a person during the early stages of psychosis, provided they have the necessary resources. Mental health first aid guidelines for psychosis have been developed for high-income countries and this study aimed to adapt those guidelines for Brazil. A Delphi expert consensus method was used to gather the views and opinions of 28 health professionals and 24 individuals with lived experience of psychosis in Brazil over two survey rounds. Firstly, 403 statements were translated from English to Brazilian-Portuguese. In the Round 1 survey, participants were asked to rate each statement based on how important they believed it was for it to be included in the Brazilian guidelines. They were also asked to suggest new actions if they wished. Consensus was reached on 257 statements. Eight new statements were created and endorsed from panelists' comments, and a further 45 statements were unique to the Brazilian guidelines. There was a modest level of similarity between the English-language and Brazilian guidelines. However, the Brazilian guidelines had a greater focus on the importance of family support for people with psychosis and stigma as a possible barrier for openly discussing help-seeking actions for mental health problems in Brazil.

Body image as a mediator in the relationship between psychotic experiences and later disordered eating: A 12-month longitudinal study in high school adolescents.

BACKGROUND: The relationship between psychosis and disordered eating remains a challenging area of research to which little interest was paid. Using longitudinal data, we aimed to explore the hypothesis that the pathways from psychotic experiences (PEs) to disordered eating (DE) and body-mass index (BMI) are mediated by body-image disturbances. METHODS: A prospective longitudinal study was performed. High-school students (N = 510, 61.2% females, mean age of 16.05 ± 1.01 years) were asked to complete three scheduled assessments (Baseline, 6 months, and 12 months). RESULTS: Two body image components, that is, Overweight Preoccupation and Body Area Satisfaction, mediated the prospective association between baseline PEs and DE 12 months later. Direct effects were significant. After accounting for indirect effects through more severe body image concerns at 6 months, higher baseline PEs were significantly associated with greater DE at 12 months. Baseline PEs and 6-month body image explained a significant proportion of variance in 12-month DE. However, we did not find evidence of a direct prospective association between PEs and BMI. CONCLUSION: This study is the first to assess the mediating role of body image between PEs and DE. Findings offer promising new avenues for early intervention to help mitigate the effects of PEs on DE in adolescents.

Impulsivity as a predictor of clinical and psychological outcomes in a naturalistic prospective cohort of subjects at ultra-high risk (UHR) for psychosis from Tunisia.

BACKGROUND: Impulsivity is associated with serious detrimental consequences on physical, mental, behavioral and social aspects of health among patients with psychosis. The present prospective 12-month follow-up study aimed to determine the prevalence of highly impulsive individuals among Ultra High Risk (UHR) patients, how impulsivity evolves over the follow-up period, and whether impulsivity impacts clinical, psychological and functional outcomes in this population. METHOD: UHR patients were invited to complete a battery of measurements at three-time points: at baseline, and at 6 and 12 months of follow-up. Impulsivity was assessed using both behavioral (the Wisconsin Card Sorting Test, WCST) and self-report (the Barratt Impulsiveness Scale, BIS-11) measures. RESULTS: Findings showed that at 6 months of follow-up, higher 6-month BIS-11 attentional and motor impulsivity were significantly associated with lower quality of life and greater general psychological distress. In addition, higher baseline BIS-11 motor impulsivity significantly predicted more severe positive psychotic symptoms at 12 months of follow-up. However, WCST scores did not show any significant associations with study variables at the different times of follow-up. CONCLUSION: Interventions targeting impulsivity in UHR individuals could help decrease psychological distress and positive psychotic symptoms' severity, as well as improve quality of life in UHR individuals.

Cannabis use influences disorganized symptoms severity but not transition in a cohort of non-help-seeking individuals at-risk for psychosis from São Paulo, Brazil.

BACKGROUND: Cannabis use is associated with an increased risk of developing a psychotic disorder. However, in individuals with at-risk mental states for psychosis (ARMS) this association is not clear, as well as the impact of cannabis use on symptom severity. The objective of this study was to evaluate the association of cannabis use patterns and ARMS risk status, transition to psychotic and psychiatric disorders, and psychopathology. METHOD: A sample of 109 ARMS and 197 control individuals was drawn from the general population. Lifetime, maximum and current amount of cannabis use were assessed with the South Westminster modified questionnaire. Participants were followed-up for a mean of 2.5 years and reassessed for transition to any psychiatric disorder. RESULTS: There were no differences between ARMS and controls regarding lifetime use, current amount of use, or maximum amount of cannabis use. There were also no differences between those who transitioned to a psychiatric disorder and those who did not regarding cannabis use variables. In ARMS individuals, cannabis use was significantly related to disorganization symptoms. CONCLUSION: The results of this study suggest that cannabis plays a role in the psychopathology of ARMS individuals, leading to more severe symptomatology.

Natural language processing in at-risk mental states: enhancing the assessment of thought disorders and psychotic traits with semantic dynamics and graph theory.

OBJECTIVE: Verbal communication has key information for mental health evaluation. Researchers have linked psychopathology phenomena to some of their counterparts in natural-language-processing (NLP). We study the characterization of subtle impairments presented in early stages of psychosis, developing new analysis techniques and a comprehensive map associating NLP features with the full range of clinical presentation. METHODS: We used NLP to assess elicited and free-speech of 60 individuals in at-risk-mental-states (ARMS) and 73 controls, screened from 4,500 quota-sampled Portuguese speaking citizens in Sao Paulo, Brazil. Psychotic symptoms were independently assessed with Structured-Interview-for-Psychosis-Risk-Syndromes (SIPS). Speech features (e.g.sentiments, semantic coherence), including novel ones, were correlated with psychotic traits (Spearman's-ρ) and ARMS status (general linear models and machine-learning ensembles). RESULTS: NLP features were informative inputs for classification, which presented 86% balanced accuracy. The NLP features brought forth (e.g. Semantic laminarity as 'perseveration', Semantic recurrence time as 'circumstantiality', average centrality in word repetition graphs) carried most information and also presented direct correlations with psychotic symptoms. Out of the standard measures, grammatical tagging (e.g. use of adjectives) was the most relevant. CONCLUSION: Subtle speech impairments can be grasped by sensitive methods and used for ARMS screening. We sketch a blueprint for speech-based evaluation, pairing features to standard thought disorder psychometric items.