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Brain, Vol. 110, No. 6, 1431-1462, 1987
© 1987 Guarantors of Brain

research-article

A CASE OF INTEGRATIVE VISUAL AGNOSIA

M. JANE RIDDOCH and GLYN W. HUMPHREYS

From the Department of Paramedical Sciences, North East London Polytechnic, Birkbeck College, University of London Cognitive Neuropsychology Research Group, Department of Psychology, Birkbeck College, University of London

Correspondence to: Dr G. W. Humphreys, Cognitive Neuropsychology Research Group, Department of Psychology, Birkbeck College, Malet Street, London WCIE 7HX.

A single case study of a patient with visual agnosia is presented. The patient had a marked impairment in visual object recognition along with good tactile object identification and a preserved ability to copy. Detailed investigations demonstrated impaired perceptual processes, with the patient's identification strongly affected by duration of stimulus exposure and by using overlapping figures. However, his stored knowledge of objects was shown to be intact. The results demonstrate that agnosia may be determined by a specific deficit in integrating form information; and that the input description for visual object recognition, disrupted in this patient, is functionally separate from stored object descriptions, which are intact. The implications of the results for understanding visual agnosia and for theories of normal visual object recognition are discussed.

Received November 11, 1985. Revised January 8, 1987. Accepted February 5, 1987.


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