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Título: Speech structure links the neural and socio-behavioural correlatesof psychotic disorders
Autor(es): Palaniyappan, Lena
Mota, Natália Bezerra
Oowise, Shamuz
Balain, Vijender
Copelli, Mauro
Ribeiro, Sidarta
Liddle, Peter
Palavras-chave: disorganisation;bipolar disorder;schizophrenia;thought disorder;gyrification;centrality;graph theory
Data do documento: 8-Jul-2018
Referência: PALANIYAPPAN, Lena; MOTA, Natália Bezerra; OOWISE, Shamuz; BALAIN, Vijender; COPELLI, Mauro; RIBEIRO, Sidarta; LIDDLE, Peter Liddle. Speech structure links theneural and socio-behavioural correlates of psychotic disorders. Pnp, jul., 2018. Disponível em: <>. Acesso em: 12 jul. 2018.
Resumo: Background: A longstanding notion in the concept of psychosis is the prominence of loosened associative links in thought processes. Assessment of such subtle aspects of thought disorders has proved to be a challenging task in clinical practice and to date no surrogate markers exist that can reliably track the physiological effects of treatments that could reduce thought disorders. Recently, automated speech graph analysis has emerged as a promising means to reliably quantify structural speech disorganization. Methods: Using structural and functional imaging, we investigated the neural basis and the functional relevance of the structural connectedness of speech samples obtained from 56 patients with psychosis (22 with bipolar disorder, 34 with schizophrenia). Speech structure was assessed by non-semantic graph analysis. Results: We found a canonical correlation linking speech connectedness and i) functional as well as developmentally relevant structural brain markers (degree centrality from resting state functional imaging and cortical gyrification index) ii) psychometric evaluation of thought disorder iii) aspects of cognitive performance (processing speed deficits) and iv) functional outcome in patients. Of various clinical metrics, only speech connectedness was correlated with biological markers. Speech connectedness filled the dynamic range of responses better than psychometric measurements of thought disorder. Conclusions: The results provide novel evidence that speech dysconnectivity could emerge from neurodevelopmental deficits and associated dysconnectivity in psychosis.
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