Agnosia

Common Name(s)

Agnosia

Agnosia is characterized by an inability to recognize and identify objects and/or persons. Symptoms may vary, according to the area of the brain that is affected.  It can be limited to one sensory modality such as vision or hearing; for example, a person may have difficulty in recognizing an object as a cup or identifying a sound as a cough. Agnosia can result from strokes, traumatic brain injury, dementia, a tumor, developmental disorders, overexposure to environmental toxins (e.g., carbon monoxide poisoning), or other neurological conditions. Visual agnosia may also occur in association with other underlying disorders. People with agnosia may retain their cognitive abilities in other areas. Treatment of primary agnosia is symptomatic and supportive; when it is caused by an underlying disorder, treatment of the disorder may reduce symptoms and help prevent further brain damage.
 

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Advocacy and Support Organizations

 

Condition Specific Organizations

Following organizations serve the condition "Agnosia" for support, advocacy or research.

There are currently no organizations listed in Disease InfoSearch that support this condition. Create a listing.

 

 

General Support Organizations

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Scientific Literature

Articles from the PubMed Database

Research articles describe the outcome of a single study. They are the published results of original research.
The terms "Agnosia" returned 37 free, full-text research articles on human participants. First 3 results:

Making memories: the development of long-term visual knowledge in children with visual agnosia.
 

Author(s): Tiziana Metitieri, Carmen Barba, Simona Pellacani, Maria Pia Viggiano, Renzo Guerrini

Journal: Neural Plast.. 2013 ;2013():306432.

 

There are few reports about the effects of perinatal acquired brain lesions on the development of visual perception. These studies demonstrate nonseverely impaired visual-spatial abilities and preserved visual memory. Longitudinal data analyzing the effects of compromised perceptions ...

Last Updated: 9 Dec 2013

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Structural and functional changes across the visual cortex of a patient with visual form agnosia.
 

Author(s): Holly Bridge, Owen M Thomas, Loredana Minini, Cristiana Cavina-Pratesi, A David Milner, Andrew J Parker

Journal: J. Neurosci.. 2013 Jul;33(31):12779-91.

 

Loss of shape recognition in visual-form agnosia occurs without equivalent losses in the use of vision to guide actions, providing support for the hypothesis of two visual systems (for "perception" and "action"). The human individual DF received a toxic exposure to carbon monoxide ...

Last Updated: 1 Aug 2013

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Agnosia for accents in primary progressive aphasia.
 

Author(s): Phillip D Fletcher, Laura E Downey, Jennifer L Agustus, Julia C Hailstone, Marina H Tyndall, Alberto Cifelli, Jonathan M Schott, Elizabeth K Warrington, Jason D Warren

Journal: Neuropsychologia. 2013 Aug;51(9):1709-15.

 

As an example of complex auditory signal processing, the analysis of accented speech is potentially vulnerable in the progressive aphasias. However, the brain basis of accent processing and the effects of neurodegenerative disease on this processing are not well understood. Here we ...

Last Updated: 22 Jul 2013

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Reviews from the PubMed Database

Review articles summarize what is currently known about a disease. They discuss research previously published by others.
The terms "Agnosia" returned 1 free, full-text review articles on human participants. First 3 results:

Implications of olfactory agnosia for understanding sex differences in schizophrenia.
 

Author(s): L Kopala, C Clark

Journal: Schizophr Bull. 1990 ;16(2):255-61.

 

In our studies, 50 percent of the male patients with schizophrenia have an olfactory agnosia. This finding is of interest because the olfactory neuroanatomical network involves brain regions found to be abnormal in patients with schizophrenia, and this olfactory deficit appears to ...

Last Updated: 30 Aug 1990

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Symptoms, Diagnosis, and Treatment

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Clinical Trial Information This information is provided by ClinicalTrials.gov

The Effect of Oxytocin on Face Perception
 

Status: Recruiting

Condition Summary: Healthy; Congenital Prosopagnosia

 

Last Updated: 17 Mar 2014

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