Associative visual agnosia without alexia
Abstract
A brain-damaged man was unable to appreciate the nature of objects and meaningful nonverbal symbols presented visually, although he could see, draw, describe, and match these stimuli. He had no difficulty understanding visually presented words. Auditory and tactile recognition of both verbal and nonverbal stimuli were normal. Our findings provide evidence that two neuropsychologic mechanisms were responsible for this disorder. One was an interhemispheric visual-verbal disconnection; the other was a specific categorization defect for visual, nonverba, meaningful stimuli. Neither mechanism alone was sufficient; both were necessary.
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P&D's hypothesis that reading is more complex and imposes greater demands on visual processing is not sufficiently articulate to account for double dissociations such as object agnosia without alexia or prosopagnosia without alexia.
“is not sufficiently articulate to account for double dissociations such as object agnosia without alexia (Albert et al., 1975; Gomori and Hawryluk, 1984) or prosopagnosia without alexia (e.g. McNeil and Warrington, 1993).”
From Specialization within the ventral stream: the case for the visual word form area (2004) · cites this paper as Albert et al., 1975
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- Authors
- ALBERT, M. L., RECHES, A., & SILVERBERG, R.
- Affiliations
- Boston University (US)
- Venue
- Neurology
- Published
- 1975-04
- Volume
- 25
- Issue
- 4
- Pages
- 322-322
- ISSN
- 0028-3878 (ISSN-L)
- 1526-632X
- OpenAlex
- W2031740952
- Cited by
- 70
- References
- 0
- Citations by year
- 2022: 1 · 2021: 2 · 2020: 1 · 2018: 2 · 2017: 2 · 2015: 2 · 2012: 1
- FWCI
- 1.13
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Neurology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Spatial Neglect and Hemispheric Dysfunction
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neurobiology of Language and Bilingualism
- Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
- Keywords
- alexia, interhemispheric disconnection, object recognition, nonverbal symbols, visual perception, brain damage
- MeSH terms
- Agnosia, Association, Auditory Perception, Brain Damage, Chronic, Confusion, Dyslexia, Acquired, Electroencephalography, Humans, Intelligence, Male, Memory, Middle Aged, Pattern Recognition, Visual, Psychological Tests, Syndrome, Touch, Visual Fields, Visual Perception, Wechsler Scales
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