Important note: Information in this article was accurate in 1994. The state of the art may have changed since the publication date.
Integrative agnosia following progressive multifocal leukoencephalopathy.
Cortex. 1994 Mar;30(1):145-58. Unique Identifier : AIDSLINE MED/94273526 Butter CM; Trobe JD; Department of Psychology, University of Michigan.
Abstract:
A 43 year-old man with presumed progressive multifocal leukoencephalopathy developed difficulty recognizing objects and faces in the presence of adequate visual acuity and visual fields. His copying and matching of line drawings was intact, suggesting that his agnosia was associative. However, he had difficulty perceiving overlapping forms and drawings of single objects as integrated wholes. Unlike control subjects, he made fewer errors identifying silhouettes compared to line drawings with internal details. These alterations, together with his feature-by-feature descriptions of objects and copying, suggest that his agnosia was due to a disturbance in integrating local form features, as described by Riddoch and Humphreys (1987). This interpretation is supported by the findings that his tactile recognition and semantic and structural knowledge of the objects he could not identify visually were intact. Furthermore, his deficient performance in categorical matching of photographs to objects was dependent upon the perceptual complexity of the photographs. Similar deficits in early form processing described by other investigators are discussed.
Keywords: Adult Agnosia/DIAGNOSIS/*PHYSIOPATHOLOGY/PSYCHOLOGY Anomia/DIAGNOSIS/PHYSIOPATHOLOGY/PSYCHOLOGY AIDS Dementia Complex/DIAGNOSIS/*PHYSIOPATHOLOGY/PSYCHOLOGY Brain Mapping Case Report Cerebral Cortex/PHYSIOPATHOLOGY Dominance, Cerebral/PHYSIOLOGY Field Dependence-Independence Human Leukoencephalopathy, Progressive Multifocal/DIAGNOSIS/ *PHYSIOPATHOLOGY/PSYCHOLOGY Male Neuropsychological Tests Orientation/PHYSIOLOGY Pattern Recognition, Visual/*PHYSIOLOGY Psychomotor Performance/*PHYSIOLOGY Recall/*PHYSIOLOGY JOURNAL ARTICLE
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Important note: Information in this article was accurate in 1994. The state of the art may have changed since the publication date.
