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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
Synesthesia01:27

Synesthesia

Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
Prosopagnosia01:24

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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
Positive Symptoms Schizophrenia: Hallucinations and Delusions01:26

Positive Symptoms Schizophrenia: Hallucinations and Delusions

Schizophrenia is a complex psychiatric disorder characterized by a range of symptoms that significantly impact cognition, behavior, and emotional regulation. Among these, the positive symptoms stand out as they involve the addition or exaggeration of normal mental functions, deviating markedly from typical behavior and perception. Hallucinations and delusions are prominent positive symptoms, each profoundly affecting the individual's experience of reality.
Hallucinations
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Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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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Updated: May 19, 2026

Visualizing Visual Adaptation
04:43

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Published on: April 24, 2017

Van Gogh syndrome.

Y B Roka1, R Thapa, P R Puri

  • 1Department of Neurosurgery, Neuro Hospital, Biratnagar, Nepal. dryamroka@yahoo.com

Journal of Nepal Health Research Council
|August 30, 2012
PubMed
Summary
This summary is machine-generated.

Self-injury, often seen in adolescents and psychiatric patients, involves intentional self-harm like biting or head banging, and is typically not suicidal. This summary focuses on two cases of self-mutilation in schizophrenic patients.

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Area of Science:

  • Psychiatry
  • Clinical Psychology

Background:

  • Self-injury is defined as intentional direct harm to oneself, encompassing behaviors like biting, burning, ulceration, and head banging.
  • These injuries are generally not fatal and are distinct from suicidal actions, frequently observed in adolescents, psychiatric populations, and females.

Observation:

  • Associated conditions include bipolar disorder, substance abuse, and metabolic disorders such as Lesch-Nyhan syndrome and Munchausen's syndrome.
  • Repetitive self-mutilation is known as Van Gogh syndrome, named after the artist who severed his ear.

Findings:

  • The study presents two case reports detailing instances of self-mutilation in patients diagnosed with schizophrenia.

Implications:

  • Highlights the occurrence of self-mutilation within schizophrenic populations.
  • Contributes to understanding the diverse manifestations of self-harm behaviors in psychiatric disorders.