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A replication study of JTC bias, genetic liability for psychosis and delusional ideation

Henquet, Cécile, van Os, Jim, Pries, Lotta K., Rauschenberg, Christian, Delespaul, Philippe, Kenis, Gunter, Luykx, Jurjen J., Lin, Bochao D., Richards, Alexander L., Akdede, Berna, Binbay, Tolga, Altinyazar, Vesile, Yalinçetin, Berna, Gümüs-Akay, Güvem, Cihan, Burçin, Soygür, Haldun, Ulas, Halis, Cankurtaran, Eylem S., Kaymak, Semra U., Mihaljevic, Marina M., Petrovic, Sanja S., Mirjanic, Tijana, Bernardo, Miguel, Mezquida, Gisela, Amoretti, Silvia, Bobes, Julio, Saiz, Pilar A., García-Portilla, Maria P., Sanjuan, Julio, Aguilar, Eduardo J., Santos, Jose L., Jiménez-López, Estela, Arrojo, Manuel, Carracedo, Angel, López, Gonzalo, González-Peñas, Javier, Parellada, Mara, Maric, Nadja P., Atbasoglu, Cem, Ucok, Alp, Alptekin, Köksal, Saka, Meram C., Arango, Celso, O'Donovan, Michael ORCID:, Rutten, Bart P.F. and Gülöksüz, Sinan 2022. A replication study of JTC bias, genetic liability for psychosis and delusional ideation. Psychological Medicine 52 (9) , pp. 1777-1783. 10.1017/S0033291720003578

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Background This study attempted to replicate whether a bias in probabilistic reasoning, or ‘jumping to conclusions’(JTC) bias is associated with being a sibling of a patient with schizophrenia spectrum disorder; and if so, whether this association is contingent on subthreshold delusional ideation. Methods Data were derived from the EUGEI project, a 25-centre, 15-country effort to study psychosis spectrum disorder. The current analyses included 1261 patients with schizophrenia spectrum disorder, 1282 siblings of patients and 1525 healthy comparison subjects, recruited in Spain (five centres), Turkey (three centres) and Serbia (one centre). The beads task was used to assess JTC bias. Lifetime experience of delusional ideation and hallucinatory experiences was assessed using the Community Assessment of Psychic Experiences. General cognitive abilities were taken into account in the analyses. Results JTC bias was positively associated not only with patient status but also with sibling status [adjusted relative risk (aRR) ratio : 4.23 CI 95% 3.46–5.17 for siblings and aRR: 5.07 CI 95% 4.13–6.23 for patients]. The association between JTC bias and sibling status was stronger in those with higher levels of delusional ideation (aRR interaction in siblings: 3.77 CI 95% 1.67–8.51, and in patients: 2.15 CI 95% 0.94–4.92). The association between JTC bias and sibling status was not stronger in those with higher levels of hallucinatory experiences. Conclusions These findings replicate earlier findings that JTC bias is associated with familial liability for psychosis and that this is contingent on the degree of delusional ideation but not hallucinations

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Additional Information: This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence 4.0
Publisher: Cambridge University Press
ISSN: 0033-2917
Date of First Compliant Deposit: 15 December 2020
Date of Acceptance: 10 September 2020
Last Modified: 05 May 2023 17:54

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