Self-disturbances in schizophrenia have been regarded as a fundamental vulnerability marker for this disease, and have begun to be studied from the standpoint of an abnormal "sense of agency (SoA)" in cognitive neuroscience. To clarify the nature of aberrant SoA in schizophrenia, it needs to be investigated in various clinical subtypes and stages. The residual type of chronic schizophrenia with predominant negative symptoms (NS) has never been investigated for SoA. Accordingly, we investigated SoA by an original agency attribution task in NS-predominant schizophrenia, and evaluated the dynamic interplay between the predictive and postdictive components of SoA in the optimal cue integration framework. We studied 20 patients with NS-predominant schizophrenia, and compared with 30 patients with paranoid-type schizophrenia and 35 normal volunteers. NS-predominant schizophrenia showed markedly diminished SoA compared to normal controls and paranoid-type schizophrenia, indicating a completely opposite direction in agency attribution compared with excessive SoA demonstrated in paranoid-type schizophrenia. Reduced SoA was detected in experimental studies of schizophrenia for the first time. According to the optimal cue integration framework, these results indicate that there was no increase in compensatory contributions of the postdictive processes despite the existence of inadequate predictions, contrary to the exaggerated postdictive component in paranoid-type schizophrenia.
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http://dx.doi.org/10.1016/j.psychres.2013.04.017 | DOI Listing |
Surg Neurol Int
December 2024
Department of Neurosurgery, Fundación Clínica Shaio, Bogotá, Colombia.
Background: Impulsive aggression is the core symptom of intermittent explosive disorder, which can be a feature of several psychiatric disorders. There is a subset of individuals who do not respond adequately to medical treatment; they are treatment refractory. The objective of this report is to describe a case of a patient with a background of schizophrenia and concomitant refractory aggressiveness disorder, treated with two-stage bilateral hypothalamotomy and unilateral amygdalotomy with Gamma Knife radiosurgery (GKR).
View Article and Find Full Text PDFCureus
November 2024
Psychiatry, Maudsley Health, Al Amal Psychiatric Hospital, Dubai, ARE.
Schizophrenia is a chronic psychiatric disorder marked by severe disturbances in thought, perception, and behavior. Long-acting injectable (LAI) antipsychotics, such as paliperidone, are widely used to promote sustained remission and ensure medication adherence, especially in patients prone to relapse. However, the COVID-19 pandemic has introduced unique challenges, with studies indicating that infections like COVID-19 may exacerbate psychiatric symptoms through neuroinflammatory pathways.
View Article and Find Full Text PDFSchizophrenia is a multifaceted psychiatric disorder characterized by hallucinations, delusions, cognitive impairments, and behavioral disturbances. Genetic factors significantly contribute to its pathogenesis, accounting for approximately 80% of the heritability. Globally, about 1% of the population is affected by schizophrenia, with 45,054 individuals in Kazakhstan receiving medical treatment for the condition, indicating a prevalence rate of 238,6 per 100,000 people.
View Article and Find Full Text PDFBMJ Ment Health
December 2024
Department of Experimental Psychology, University of Oxford, Oxford, UK.
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