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- Positive_visual_phenomena abstract "Lesions in the visual pathway affect vision most often by creating deficits or negative phenomena, such as blindness, visual field deficits or scotomas, decreased visual acuity and color blindness. On occasion, they may also create false visual images, called positive visual phenomena. These images can be a result of distortion of incoming sensory information leading to an incorrect perception of a real image called an illusion. When the visual system produces images which are not based on sensory input, they can be referred to as hallucinations. The visual phenomena may last from brief moments to several hours, but they also can be permanent. They are generally associated with other symptoms but occasionally are isolated. Conditions causing these phenomena include disruptions in the visual input along the pathways (retina, optic nerve, chiasmal and retrochiasmal lesions) lesions in the extracortical visual system, migraines, seizures, toxic-metabolic encephalopathy, psychiatric conditions and sleep apnea, among others. The mechanisms underlying positive visual phenomena are not yet well understood. Possible mechanisms may be: 1) defect in the sensory input causing compensatory upregulation of the visual cortex, 2) faulty visual processing in which inputs are normal but lesions result in an inappropriate pattern of cortical excitation, 3)variants of normal visual processing. Of all forms of hallucination, visual hallucinations are the least likely to be associated with psychiatric disorders. For example most patients with visual hallucinations do not have schizophrenia and most patients with schizophrenia do not have visual hallucinations.".
- Positive_visual_phenomena wikiPageID "21927040".
- Positive_visual_phenomena wikiPageLength "5210".
- Positive_visual_phenomena wikiPageOutDegree "14".
- Positive_visual_phenomena wikiPageRevisionID "639797913".
- Positive_visual_phenomena wikiPageWikiLink Category:Optical_illusions.
- Positive_visual_phenomena wikiPageWikiLink Color_blindness.
- Positive_visual_phenomena wikiPageWikiLink Delusion.
- Positive_visual_phenomena wikiPageWikiLink Encephalopathy.
- Positive_visual_phenomena wikiPageWikiLink Epileptic_seizure.
- Positive_visual_phenomena wikiPageWikiLink Hallucination.
- Positive_visual_phenomena wikiPageWikiLink Illusion.
- Positive_visual_phenomena wikiPageWikiLink Migraine.
- Positive_visual_phenomena wikiPageWikiLink Optic_chiasm.
- Positive_visual_phenomena wikiPageWikiLink Optic_nerve.
- Positive_visual_phenomena wikiPageWikiLink Retina.
- Positive_visual_phenomena wikiPageWikiLink Scotoma.
- Positive_visual_phenomena wikiPageWikiLink Visual_release_hallucinations.
- Positive_visual_phenomena wikiPageWikiLink Visual_system.
- Positive_visual_phenomena wikiPageWikiLinkText "Visual abnormalities".
- Positive_visual_phenomena wikiPageWikiLinkText "positive phenomena".
- Positive_visual_phenomena wikiPageUsesTemplate Template:No_footnotes.
- Positive_visual_phenomena subject Category:Optical_illusions.
- Positive_visual_phenomena type Illusion.
- Positive_visual_phenomena comment "Lesions in the visual pathway affect vision most often by creating deficits or negative phenomena, such as blindness, visual field deficits or scotomas, decreased visual acuity and color blindness. On occasion, they may also create false visual images, called positive visual phenomena. These images can be a result of distortion of incoming sensory information leading to an incorrect perception of a real image called an illusion.".
- Positive_visual_phenomena label "Positive visual phenomena".
- Positive_visual_phenomena sameAs Q7233300.
- Positive_visual_phenomena sameAs m.05p1pjt.
- Positive_visual_phenomena sameAs Q7233300.
- Positive_visual_phenomena wasDerivedFrom Positive_visual_phenomena?oldid=639797913.
- Positive_visual_phenomena isPrimaryTopicOf Positive_visual_phenomena.