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Related Concept Videos

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...
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,...
Positive Symptoms of Schizophrenia: Hallucinations and Delusions01:30

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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.
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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.
Psychosis and Antipsychotic Drugs: Overview01:28

Psychosis and Antipsychotic Drugs: Overview

The term "psychosis" refers to a spectrum of mental disorders characterized by abnormal thoughts, perceptions, and behaviors. It can manifest as mood disorders, dementia, delirium with psychotic features, substance-induced psychosis with psychotic features, brief psychotic disorder, delusional disorder, schizoaffective disorder, and schizophrenia. Among all these disorders, schizophrenia is the most common psychotic disorder, affecting 1% of the worldwide population. Psychotic symptoms in all...
Attention-Deficit/Hyperactivity Disorder01:30

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Diagnostic Criteria and Symptoms
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Standardized Data Acquisition for Neuromelanin-Sensitive Magnetic Resonance Imaging of the Substantia Nigra
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Alpha rhythm and hypofrontality in schizophrenia.

M G Knyazeva1, M Jalili, R Meuli

  • 1Department of Neurology, Centre Hospitalier Universitaire Vaudois and University of Lausanne and Department of Radiology, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland. maria.knyazeva@chuv.ch

Acta Psychiatrica Scandinavica
|July 19, 2008
PubMed
Summary
This summary is machine-generated.

Electroencephalography (EEG) in schizophrenia (SZ) reveals reduced overall brain power, particularly in alpha and beta bands. Findings support the hypofrontality concept in SZ, with alpha rhythm indicating prefrontal deactivation.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Brain Imaging

Background:

  • Schizophrenia (SZ) is associated with hypofrontality, a reduced activity in prefrontal brain regions.
  • Electroencephalography (EEG) offers insights into brain activity patterns.
  • Understanding EEG correlates of hypofrontality is crucial for schizophrenia research.

Purpose of the Study:

  • To identify electroencephalography (EEG) markers associated with resting hypofrontality in schizophrenia.
  • To investigate the relationship between EEG abnormalities and clinical symptoms in schizophrenia patients.

Main Methods:

  • Analyzed whole-head EEG topography in 14 schizophrenia patients and 14 matched controls.
  • Utilized a novel parameterization of multichannel EEG, combining regional surface mapping and global effect evaluation.
  • Employed power measures across different frequency bands (alpha, beta).

Main Results:

  • Schizophrenia patients exhibited a global decrease in absolute EEG power, notably in alpha and beta bands.
  • A relative increase in alpha power was observed over prefrontal regions, contrasting with posterior regions.
  • These alpha band abnormalities correlated with Positive and Negative Symptom Scale scores and illness chronicity.

Conclusions:

  • The findings support the hypofrontality concept in schizophrenia.
  • Alpha activity, linked to regional deactivation, serves as a sensitive indicator of hypofrontality in SZ.
  • EEG analysis provides valuable biomarkers for understanding schizophrenia pathophysiology.