Abstract
Formal thought disorder (FTD) is a disruption in the flow of thought, which is inferred from disorganisation of spoken language. FTD in autism spectrum disorders (ASD) might be a precursor of psychotic disorders or a manifestation of ASD symptom severity. The current longitudinal study is a seven-year follow-up of 91 individuals aged 5–12 years with ASD. We tested (1) whether childhood FTD predicted prodromal symptoms of psychosis in adolescence and (2) whether childhood FTD was associated with greater ASD symptom severity in adolescence. ASD symptom severity was assessed in childhood (T1) and 7 years later (T2), using the autism diagnostic observation schedule (ADOS). At T1, the Kiddie-Formal Thought Disorder Rating Scale (KFTDS) was used to measure symptoms of FTD. At T2, the prodromal questionnaire (PQ) was used to assess prodromal symptoms of psychosis. FTD at T1 did not predict prodromal symptoms of psychosis at T2 in children with ASD. FTD symptoms at T1, namely illogical thinking, predicted ASD symptom severity at T2 and this effect remained significant after controlling for T1 ASD symptom severity. In children with ASD, illogical thinking predicts severity of ASD symptoms in adolescence, but FTD does not predict prodromal symptoms of psychosis.
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Acknowledgments
The authors thank all children and parents who participated in the study. We appreciated very much that such a large proportion of the original participants were willing to engage in this seven-year follow-up study. This study is based on collaboration between Erasmus University Medical Center—Sophia, Rotterdam and Yulius, Organisation for Mental Health, Dordrecht/Barendrecht. The project was supported financially by a grant from the Sophia Foundation for Scientific Research (SSWO; grant 586, 2009), by a grant from the Nuts Ohra Foundation 0803-53), by a grant from the Netherlands Organisation for Scientific Research (NWO/ZonMw/OOG-100-002-006) and by the participating centres. We thank all our research colleagues for their helpful suggestions.
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Eussen, M.L.J.M., de Bruin, E.I., Van Gool, A.R. et al. Formal thought disorder in autism spectrum disorder predicts future symptom severity, but not psychosis prodrome. Eur Child Adolesc Psychiatry 24, 163–172 (2015). https://doi.org/10.1007/s00787-014-0552-9
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DOI: https://doi.org/10.1007/s00787-014-0552-9