A case of visual agnosia showing a disorder of pre-semantic visual classification.
A case (J.R.) of associative visual agnosia (loss of meaning for visually presented objects without any serious sensory disorder) is reported. When asked to match a given name to sample the patient made both visual and semantic errors. Whereas semantic errors were reduced by priming, visual errors were intractable. It is argued that there is a disorder at the stage of pre-semantic abstraction, similar to that postulated elsewhere for some cases of deep dyslexia, contributing to the agnosia.
D000328:Adult; D000377:Agnosia / Q000209:etiology / Q000523:psychology*; D001244:Association / Q000502:physiology; D001930:Brain Injuries / Q000150:complications; D003463:Cues; D005260:Female; D006801:Humans; D008568:Memory / Q000502:physiology; D012660:Semantics; D014796:Visual Perception / Q000502:physiology*