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Schizophrenia

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.

Biological Causes of Schizophrenia

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 Disorders

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 Schizophrenia

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...

Negative and Cognitive Symptoms of Schizophrenia

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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Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study

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Lempel-Ziv complexity in schizophrenia: a MEG study.

Alberto Fernández¹, María-Inés López-Ibor, Agustín Turrero

¹Department of Psychiatry and Psychological Medicine, Complutense University, Madrid, Spain. aferlucas@med.ucm.es

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology

|May 20, 2011

Summary

Schizophrenia (SCH) patients show reduced brain complexity with age, unlike healthy individuals. This progressive decline in complexity suggests neurodegenerative aspects in schizophrenia, complementing developmental theories.

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Area of Science:

Neuroscience
Psychiatry

Background:

The neuropathological basis of schizophrenia (SCH) is debated, with ongoing discussion about neurodevelopmental versus neurodegenerative origins.
Neurophysiological techniques, particularly nonlinear analysis, offer novel approaches to investigate this debate.

Purpose of the Study:

To investigate the neurophysiological underpinnings of schizophrenia using nonlinear analysis.
To explore the relationship between brain complexity, age, and schizophrenia.

Main Methods:

Resting-state magnetoencephalography (MEG) was performed on 15 patients with schizophrenia and 15 age- and sex-matched controls.
Lempel-Ziv complexity (LZC) scores were calculated from MEG data to quantify brain signal complexity.

Main Results:

LZC scores demonstrated a strong age dependency in both groups.
Control subjects showed increasing LZC scores with age, while schizophrenia patients exhibited a progressive reduction in LZC.
A logistic model incorporating LZC, age, and their interaction accurately classified patients and controls.

Conclusions:

Schizophrenia patients do not exhibit the typical age-related increase in brain complexity.
The observed reduction in complexity with age in schizophrenia patients mirrors patterns seen in neurodegenerative diseases.
These findings support a progressive neuropathological process in schizophrenia, which may coexist with neurodevelopmental factors.