Agnosia

Definition

Agnosia is a neurological disorder characterized by an inability to process sensory information. Often there is a loss of ability to recognize objects, persons, sounds, shapes, or smells while the specific sense is neither defective nor is there any significant memory loss. It is usually associated with brain injury or neurological illness, particularly after damage to the occipitotemporal border, which is part of the ventral stream. Agnosia affects only a single modality, such as vision or hearing. More recently, a top-down interruption is considered to cause the disturbance of handling perceptual information.

Related concepts

Acquired brain injury Agnoiology Agnosia (film)Agnosia (moth)Akinetopsia Alexia (acquired dyslexia)Ancient Greek Anosognosia Apperceptive agnosia Associative visual agnosia Astereognosis Auditory agnosia Auditory system Auditory verbal agnosia Autotopagnosia Brodmann area 37 Bálint syndrome Carl Wernicke Cerebral achromatopsia Cerebral cortex ClinicalTrials.gov Color agnosia Constructional apraxia Cortical deafness Dementia Dressing apraxia Finger agnosia Gerstmann syndrome Heterotopagnosia ICD-10 ICD-11 Insight Integrative agnosia International Statistical Classification of Diseases and Related Health Problems Lesion List of ICD-9 codes Medical Subject Headings Medical specialty Memory loss National Institute of Neurological Disorders and Stroke Neuroimaging Neurological disorder Neurological illness Neurology Neuropsychology Occipital lobe Occupational therapy Pain agnosia Parietal lobe Perception Phonagnosia Prosopagnosia Psychiatry Pure alexia Pyrrho Rare disease Receptive aphasia Recognition memory Recovery from blindness Right-left confusion SNOMED CT Scientific American Sense Sense of smell Sigmund Freud Simultagnosia Social-emotional agnosia Somatosensory cortex Somatosensory system Speech Speech therapy Stimulus modality Striate cortex Stroke Superior temporal gyrus Superior temporal sulcus Supramarginal gyrus Tactile agnosia The New Yorker Topographical disorientation Ventral stream Visual agnosia Visuospatial dysgnosia

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