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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...
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...
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,...
Language and Cognition01:27

Language and Cognition

Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.

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Related Experiment Video

Updated: Jul 6, 2026

Measurement of Fronto-limbic Activity Using an Emotional Oddball Task in Children with Familial High Risk for Schizophrenia
13:08

Measurement of Fronto-limbic Activity Using an Emotional Oddball Task in Children with Familial High Risk for Schizophrenia

Published on: December 2, 2015

Structural cerebral variations as useful endophenotypes in schizophrenia: do they help construct "extended

Konasale M Prasad1, Matcheri S Keshavan

  • 1Western Psychiatric Institute and Clinic, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA.

Schizophrenia Bulletin
|April 15, 2008
PubMed
Summary
This summary is machine-generated.

Brain structural variations, or morphometric measures, show promise as endophenotypes for schizophrenia. These measurable brain differences are heritable and found in relatives, aiding the study of schizophrenia

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Genetics

Background:

  • Endophenotypes link genes to complex traits like schizophrenia.
  • Neurocognitive and neurophysiological deficits are studied as schizophrenia endophenotypes.
  • Brain structural variations underlying these deficits are less explored as endophenotypes.

Purpose of the Study:

  • To critically review brain structural alterations in schizophrenia.
  • To evaluate their candidacy as endophenotypes for schizophrenia.
  • To assess their utility in understanding schizophrenia's etiology and pathophysiology.

Main Methods:

  • Literature review of neuroanatomical variations in schizophrenia.
  • Evaluation of brain morphometric measures against established endophenotype criteria.

Main Results:

  • Brain morphometric measures meet key endophenotype criteria: association with schizophrenia, heritability, quantifiability, and familiality.
  • Structural brain alterations appear to be valid endophenotypes for psychotic disorders.

Conclusions:

  • Brain morphometric alterations largely meet endophenotype criteria for psychotic disorders.
  • The concept of an "extended endophenotype" combining multiple measures is proposed.
  • Further research is needed on gene-environment interactions affecting brain structure and function in psychotic disorders.