Encyclopedia of Clinical Neuropsychology

2011 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

Apperceptive Visual Agnosia

  • John E. Mendoza
Reference work entry
DOI: https://doi.org/10.1007/978-0-387-79948-3_705

Definition

Inability or marked difficulty in visually identifying an object or picture of an object as a result of impaired perceptual abilities. In apperceptive agnosia, in addition to problems in the visual identification of an object, patients show impairment in reproducing (e.g., by drawing) the object or image and even matching the item to a similar one within a visual array. This contrasts with associative visual agnosia in which identification may also be impaired but the patient can usually render a reasonable representation (e.g., a drawing or graphomotor copy) of the object that cannot be visually identified and can visually match it to a sample. Apperceptive visual agnosia likely results from a defect in the secondary association areas of the visual cortex and is usually found in patients who complain of general loss or reduction in visual acuity.

Cross References

References and Readings

  1. Bauer, R. M., & Demery, J. A. (2003). Agnosia. In K. Heilman & E. Valenstein (Eds.), Clinical neuropsychology (4th ed., pp. 236–295). New York: Oxford University Press.Google Scholar
  2. DeRenzi, E., & Spinnler, H. (1966). Visual recognition in patients with unilateral cerebral disease. Journal of Nervous and Mental Disease, 142, 513–525.Google Scholar
  3. DeRenzi, E., Scotti, G., & Spinnler, H. (1969). Perceptual and associative disorders of visual recognition. Relationship to the side of the cerebral lesion. Neurology, 19, 634–642.Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • John E. Mendoza
    • 1
  1. 1.SE LA Veterans Healthcare System Department of Psychiatry and NeurologyTulane University Medical CenterNew OrleansUSA