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Related Concept Videos

Psychological and Sociocultural Causes of Schizophrenia01:29

Psychological and Sociocultural Causes of Schizophrenia

Schizophrenia, a complex psychiatric disorder, has been historically misunderstood. Early psychological theories attributed its origins to childhood trauma and unresponsive parenting. However, contemporary research largely rejects these notions, favoring the vulnerability-stress hypothesis. This model proposes that individuals with a genetic predisposition to schizophrenia may develop the disorder following exposure to significant environmental stressors. Notably, studies on high-risk...
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Schizophrenia, a term introduced by Swiss psychiatrist Eugen Bleuler in 1911, describes a severe psychological disorder marked by profound disruptions in attention, thought processes, language, emotion, and interpersonal relationships. The core feature of schizophrenia is psychosis — a state characterized by a fundamental detachment from reality. This disconnection manifests through distorted logic, impaired perception, and atypical behavior, severely affecting the lives of those diagnosed.
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Handwriting Analysis Indicates Spontaneous Dyskinesias in Neuroleptic Naïve Adolescents at High Risk for Psychosis
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Intra-individual variability in high-functioning patients with schizophrenia.

Mirjam Rentrop1, Katlehn Rodewald, Alexander Roth

  • 1Section of Experimental Psychopathology, Department of Psychiatry, Centre for Psychosocial Medicine, University of Heidelberg, Germany.

Psychiatry Research
|May 8, 2010
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Intra-individual variability of reaction times (IIV) in schizophrenia patients reveals significant cognitive processing instability. This measure, unlike average performance, effectively identifies subtle deficits and correlates with work capability, suggesting clinical utility.

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Published on: December 2, 2015

Area of Science:

  • Cognitive Neuroscience
  • Psychiatry
  • Psychometrics

Background:

  • Intra-individual variability of reaction times (IIV) measures information processing stability.
  • IIV disturbances are hypothesized in schizophrenia, but clinical significance remains unclear due to prior studies on generalized cognitive impairment.

Purpose of the Study:

  • To assess IIV in high-functioning schizophrenia patients with preserved cognitive performance.
  • To determine if IIV can differentiate between high-functioning patients and controls.

Main Methods:

  • 28 high-functioning schizophrenia patients and 28 controls completed a Go/Nogo task and a Continuous Performance Test.
  • Ex-Gaussian distribution modeling was used to analyze reaction time variability.

Main Results:

  • IIV significantly differentiated between schizophrenia patients and controls with large effect sizes, outperforming average performance measures.
  • Schizophrenia patients exhibited a higher proportion of slow responses (increased tau parameter).
  • The tau parameter correlated with work capability in patients with schizophrenia.

Conclusions:

  • IIV is a sensitive measure for detecting fundamental cognitive deficits in high-functioning schizophrenia patients.
  • Increased slow responses (higher tau) may indicate a core deficit in information processing stability.
  • IIV shows potential as a clinical measure, particularly regarding its relationship with work capability.