Browsing by Author "Cella, Matteo"
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- A Cross-National Investigation of Hallucination-Like Experiences in 10 Countries: The E-CLECTIC StudyPublication . Siddi, Sara; Ochoa, Susana; Laroi, Frank; Cella, Matteo; Raballo, Andrea; Saldivia, Sandra; Quijada, Yanet; Laloyaux, Julien; Rocha, Nuno; Lincoln, Tania M; Schlier, Björn; Ntouros, Evangelos; Bozikas, Vasileios P; Gawęda, Łukasz; Machado, Sergio; Nardi, Antonio E; Rodante, Demián; Deshpande, Smita N; Haro, Josep Maria; Preti, AntonioHallucination-like experiences (HLEs) are typically defined as sensory perceptions in the absence of external stimuli. Multidimensional tools, able to assess different facets of HLEs, are helpful for a better characterization of hallucination proneness and to investigate the cross-national variation in the frequencies of HLEs. The current study set out to establish the validity, factor structure, and measurement invariance of the Launay-Slade Hallucinations Scale-Extended (LSHS-E), a tool to assess HLEs. A total of 4419 respondents from 10 countries were enrolled. Network analyses between the LSHS-E and the 3 dimensions of the Community Assessment of Psychic Experiences (CAPE) were performed to assess convergent and divergent validity of the LSHS-E. Confirmatory factor analysis was used to test its measurement invariance. The best fit was a 4-factor model, which proved invariant by country and clinical status, indicating cross-national stability of the hallucination-proneness construct. Among the different components of hallucination-proneness, auditory-visual HLEs had the strongest association with the positive dimension of the CAPE, compared with the depression and negative dimensions. Participants who reported a diagnosis of a mental disorder scored higher on the 4 LSHS-E factors. Small effect size differences by country were found in the scores of the 4 LSHS-E factors even after taking into account the role of socio-demographic and clinical variables. Due to its good psychometric properties, the LSHS-E is a strong candidate tool for large investigations of HLEs.
- A cross-national investigation of psychosis-like experiences in five European countries included in the E-CLECTIC study: Psychometric challenges in studying their measurementPublication . Siddi, Sara; Ochoa, Susana; Larøi, Frank; Lincoln, Tania M.; Schlier, Bjorn; Zaytseva, Yuliya; Laloyaux, Julien; Kozáková, Eva; Cella, Matteo; Ntouros, Evangelos; Bozikas, Vasileios; Rocha, Nuno; Gawęda, Łukasz; Rocha, Susana Aguiar; Preti, AntonioPsychotic-like experiences (PLEs) are subtle, subclinical perturbations of perceptions and thoughts and are common in the general population. Their characterisation and unidimensionality are still debated. This study was conducted by the Electronic–halluCinations-Like Experiences Cross-culTural International Consortium (E-CLECTIC) and aimed at measuring the Community Assessment of Psychic Experiences (CAPE) factorial structure across five European countries (Belgium; Czech Republic, Germany; Greece, and Spain) and testing the adequacy of the unidimensional polytomous Rasch model of the tool via Partial Credit Model (PCM) of the CAPE to detect people with a high risk for developing psychosis. The sample included 1461 participants from the general population. The factorial analysis confirmed the best fit for the bifactor implementation of the three-factor model, including the positive, negative and depressive dimensions and a general factor. Moreover, the unidimensional polytomous Rasch analysis confirmed that CAPE responses reflected one underlying psychosis proneness. The study proved that the CAPE measures a single latent dimension of psychosis-proneness. The CAPE might help locate and estimate psychosis risk and can be used as a screening tool in primary care settings/education settings.