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Related Concept Videos

Psychological and Sociocultural Causes of Schizophrenia01:29

Psychological and Sociocultural Causes of Schizophrenia

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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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Schizophrenia01:17

Schizophrenia

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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...
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Psychosis: Pathophysiology of Schizophrenia and Other Psychotic Disorders01:27

Psychosis: Pathophysiology of Schizophrenia and Other Psychotic Disorders

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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...
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Personality Disorders: Paranoid and Schizoid01:22

Personality Disorders: Paranoid and Schizoid

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Personality disorders represent enduring cognition, affect, and behavior patterns that significantly deviate from societal norms. These maladaptive traits often lead to difficulties in various domains, including interpersonal relationships, occupational settings, and overall psychological well-being. Paranoid personality disorder and schizoid personality disorder are two distinct conditions marked by odd or eccentric behavior.
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Personality Disorders: Schizotypal and Histrionic01:20

Personality Disorders: Schizotypal and Histrionic

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Schizotypal personality disorder and histrionic personality disorder are two distinct psychological conditions classified under personality disorders, each characterized by unique behavioral patterns and social difficulties. Both disorders significantly affect interpersonal relationships and emotional well-being, leading to social isolation and frustration.
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Bystander Effect02:09

Bystander Effect

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The discussion of bullying highlights the problem of witnesses not intervening to help a victim. This is a common occurrence, as the following well-publicized event demonstrates. In 1964, in Queens, New York, a 19-year-old woman named Kitty Genovese was attacked by a person with a knife near the back entrance to her apartment building and again in the hallway inside her apartment building. When the attack occurred, she screamed for help numerous times and eventually died from her stab wounds.
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Related Experiment Video

Updated: Jun 16, 2025

Handwriting Analysis Indicates Spontaneous Dyskinesias in Neuroleptic Naïve Adolescents at High Risk for Psychosis
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Psychosis and the Risk of Stranger Homicides.

Ilkka Ojansuu1, Markku Lähteenvuo1, Jari Tiihonen1,2,3

  • 1Department of Forensic Psychiatry, Niuvanniemi Hospital, Kuopio, Finland.

Schizophrenia Bulletin Open
|August 15, 2024
PubMed
Summary
This summary is machine-generated.

Individuals with psychosis have a 3- to 5-fold increased risk of committing stranger homicides compared to those without psychosis. Most stranger homicides are committed by individuals without psychosis.

Keywords:
epidemiologyhomicidepsychosisstranger

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Area of Science:

  • Forensic Psychiatry
  • Criminology
  • Public Health

Background:

  • Psychosis is a known risk factor for homicide.
  • Victim selection in homicides committed by individuals with psychosis requires further investigation.
  • Stranger homicides attract significant public attention despite their rarity.

Purpose of the Study:

  • To investigate the relationship between offender psychosis and victim selection in homicide.
  • To compare the incidence of stranger homicide committed by individuals with and without psychosis.

Main Methods:

  • Analysis of forensic psychiatric reports of 389 homicide perpetrators in Finland (1980-2014).
  • Comparison of stranger homicide incidence between individuals with psychosis and a control group without psychosis (2003-2014).
  • Calculation of incidence rates per 100,000 person-years using Finnish population data.

Main Results:

  • Individuals with psychosis committed stranger homicides at an incidence of 0.022 per 100,000 person-years.
  • Individuals without psychosis committed stranger homicides at an incidence of 0.13 per 100,000 person-years.
  • When including victims known for less than 24 hours, incidence was 0.031 for those with psychosis and 0.28 for those without.

Conclusions:

  • Despite lower absolute numbers, individuals with psychosis have a significantly higher risk (3- to 5-fold) of committing stranger homicides.
  • The majority of stranger homicides are committed by individuals without psychosis.