Aberrant connectivity in auditory precision encoding in schizophrenia spectrum disorder and across the continuum of psychotic-like experiences.
Schizophr Res
; 222: 185-194, 2020 08.
Article
en En
| MEDLINE
| ID: mdl-32593736
ABSTRACT
BACKGROUND:
The ability to generate a precise internal model of statistical regularities is impaired in schizophrenia. Predictive coding accounts of schizophrenia suggest that psychotic symptoms may be explained by a failure to build precise beliefs or a model of the world. The precision of this model may vary with context. For example, in a noisy environment the model will be more imprecise compared to a model built in an environment with lower noise. However compelling, this idea has not yet been empirically studied in schizophrenia.METHODS:
In this study, 62 participants engaged in a stochastic mismatch negativity paradigm with high and low precision. We included inpatients with a schizophrenia spectrum disorder (N = 20), inpatients with a psychiatric disorder but without psychosis (N = 20), and healthy controls (N = 22), with comparable sex ratio and age distribution. Bayesian mapping and dynamic causal modelling were employed to investigate the underlying microcircuitry of precision encoding of auditory stimuli.RESULTS:
We found strong evidence (exceedance P > 0.99) for differences in the underlying connectivity associated with precision encoding between the three groups as well as on the continuum of psychotic-like experiences assessed across all participants. Critically, we show changes in interhemispheric connectivity between the two inpatient groups, with some connections further aligning on the continuum of psychotic-like experiences.CONCLUSIONS:
While our results suggest continuity in backward connectivity alterations with psychotic-like experiences regardless of diagnosis, they also point to specificity for the schizophrenia spectrum disorder group in interhemispheric connectivity alterations.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Trastornos Psicóticos
/
Esquizofrenia
/
Percepción Auditiva
Tipo de estudio:
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
Schizophr Res
Asunto de la revista:
PSIQUIATRIA
Año:
2020
Tipo del documento:
Article