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NEUROLOGY 1975;25:322
© 1975 American Academy of Neurology

Associative visual agnosia without alexia

MARTIN L. ALBERT, M.D., AVINOAM RECHES, M.D. and RUTH SILVERBERG, M.D.

Aranne Laboratory for Human Psychophysiology, Department of Neurology, Hadassah University Hospital-Hebrew University Medical School, Jerusalem, Israel, and the Neurobehavioral and Aphasia Research Centers, Department of Neurology, Boston University Medical Center and Boston Veterans Administration Hospital, Boston.

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, nonverbal, meaningful stimuli. Neither mechanism alone was sufficient; both were necessary.

Received for publication July 16, 1974.

Dr. Albert's current address is Department of Neurology, Hadassah University Hospital, Jerusalem, Israel.




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PNAS, April 28, 1998; 95(9): 5413 - 5416.
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