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

Positive Symptoms of Schizophrenia: Hallucinations and Delusions

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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 diagnosed.
Positive Symptoms Schizophrenia: Hallucinations and Delusions01:26

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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.
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Negative and Cognitive Symptoms of Schizophrenia01:30

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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.
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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

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Published on: April 16, 2014

Visual perception and its impairment in schizophrenia.

Pamela D Butler1, Steven M Silverstein, Steven C Dakin

  • 1Nathan Kline Institute for Psychiatric Research, Orangeburg, NY 10962, USA. butler@nki.rfmh.org

Biological Psychiatry
|June 14, 2008
PubMed
Summary

Schizophrenia research is expanding to include perception, not just cognition. Visual processing, focusing on gain control and integration, is crucial for understanding and treating perceptual deficits in schizophrenia.

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Area of Science:

  • Cognitive Neuroscience
  • Psychiatry
  • Visual Perception Research

Background:

  • Schizophrenia research has historically emphasized attention, memory, and executive functions.
  • Perceptual processing deficits are common in schizophrenia but less studied.
  • The Cognitive Neuroscience Treatment Research to Improve Cognition in Schizophrenia (CNTRICS) project now includes perception.

Purpose of the Study:

  • To discuss the importance and nature of perceptual dysfunction in schizophrenia.
  • To identify the need for perceptual tests in clinical trials.
  • To introduce visual perception concepts relevant to schizophrenia.

Main Methods:

  • The article summarizes discussions from the first CNTRICS meeting.
  • Focus was on visual processing deficits, including gain control and integration.
  • Concepts were defined with examples relevant to schizophrenia.

Main Results:

  • Perceptual dysfunction is a significant area for schizophrenia research.
  • Visual gain control and integration offer fundamental constructs for understanding visual deficits.
  • These concepts encompass both lower-level and higher-level perceptual impairments.

Conclusions:

  • Perceptual deficits, especially visual, are critical in schizophrenia.
  • Gain control and integration are key concepts for studying visual perception in schizophrenia.
  • Developing perceptual tests is vital for future schizophrenia treatment research.