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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...
Biological Causes of Schizophrenia01:29

Biological Causes of Schizophrenia

Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
Psychosis: Pathophysiology of Schizophrenia and Other Psychotic Disorders01:27

Psychosis: Pathophysiology of Schizophrenia and Other Psychotic Disorders

Schizophrenia is a neurodevelopmental disorder whose origins are rooted in complex genetic components. Despite our burgeoning understanding, the pathophysiology of this disorder remains incompletely deciphered.
Researchers have identified genetic factors that increase susceptibility to schizophrenia, underscoring the intricate interplay between genetics and environment in disease development. At the core of schizophrenia's pathophysiology is excessive dopaminergic neurotransmission within the...
Schizophrenia01:17

Schizophrenia

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.
Positive Symptoms of Schizophrenia: Hallucinations and Delusions01:30

Positive Symptoms of Schizophrenia: Hallucinations and Delusions

Schizophrenia is a complex mental health disorder that can manifest with various positive symptoms, including thought, movement, and behavior disorders. These symptoms significantly disrupt cognitive and motor functions, leading to profound effects on an individual's ability to engage with the world.
Thought Disorders
Disorganized and unusual thought processes mark thought disorders in schizophrenia. One key feature is disorganized speech, where an individual's conversation includes loosely...
Negative and Cognitive Symptoms of Schizophrenia01:30

Negative and Cognitive Symptoms of Schizophrenia

Negative symptoms of schizophrenia indicate a reduction or absence of typical behaviors and emotional responses found in healthy individuals, while positive symptoms reflect an excess or distortion of normal functioning.
Negative Symptoms
Negative symptoms of schizophrenia manifest as deficits in normal emotional and behavioral functioning, profoundly impacting daily life. Individuals with schizophrenia often display a flat affect, characterized by a near-total absence of emotional expression,...

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Related Experiment Video

Updated: Jun 3, 2026

Measurement of Fronto-limbic Activity Using an Emotional Oddball Task in Children with Familial High Risk for Schizophrenia
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Random number generation deficit in early schizophrenia.

Kevin Ka-Shing Chan1, Christy Lai-Ming Hui, Jennifer Yee-Man Tang

  • 1Department of Psychiatry, The University of Hong Kong, SAR, China.

Perceptual and Motor Skills
|April 7, 2011
PubMed
Summary

Early schizophrenia patients show deficits in random number generation, impacting strategy maintenance and increasing stereotyped responses. These executive function impairments are present early in the illness, though some aspects are less affected than in chronic cases.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Psychology

Background:

  • Random number generation (RNG) tasks are sensitive markers of executive functions.
  • Impaired RNG performance is documented in chronic schizophrenia.
  • The presence and profile of RNG deficits in early schizophrenia remain understudied.

Purpose of the Study:

  • To investigate random number generation abilities in early schizophrenia.
  • To compare the executive function profile in early versus chronic schizophrenia.

Main Methods:

  • A cohort of 44 early schizophrenia patients and 48 healthy controls completed written RNG tasks.
  • Performance was analyzed for strategy maintenance, stereotyped sequences, randomness identification, and digit equality monitoring.

Main Results:

  • Early schizophrenia patients exhibited difficulties in maintaining production strategies.
  • Patients generated more stereotyped response sequences compared to controls.
  • Abilities to identify randomness and monitor digit equality were largely preserved.

Conclusions:

  • Executive function deficits in RNG are present at the early stages of schizophrenia.
  • Specific aspects of RNG impairment, like strategy maintenance, are evident early, while others may evolve over time.