Apperceptive Visual Agnosia: A Case Study

P. A. Shelton, D. Bowers, R. Duara, K. M. Heilman

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

A man with an infarction of his inferior temporal and occipital association cortex bilaterally, which spared primary visual cortex, had impaired visual recognition of objects, faces, colors, words, and gestures. Analysis of visual function indicated that the recognition failures resulted from an agnosia, rather than elemental visual impairment. Whereas his impairment of gesture recognition appeared to be related to an associative agnosia, his inability to recognize objects was related to an apperceptive agnosia. There may be four subtypes of apperceptive agnosia: one where the internal object representations or structural descriptions are impaired, another where an adequate percept cannot be derived, a third where the internal referent and percept are dissociated, and a fourth where both levels are impaired. Our patient demonstrated a failure to relate individual elements to the whole, a failure to integrate multiple elements, and a reliance on global perception. He had normal object imagery. These results suggest that, whereas internal representations were intact, he was unable to form adequate perceptual representations.

Original languageEnglish
Pages (from-to)1-23
Number of pages23
JournalBrain and Cognition
Volume25
Issue number1
DOIs
StatePublished - May 1 1994
Externally publishedYes

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Agnosia
Gestures
Occipital Lobe
Imagery (Psychotherapy)
Vision Disorders
Visual Cortex
Infarction
Color
Recognition (Psychology)
Gesture
Cortex
Impairment
Percept

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience

Cite this

Shelton, P. A., Bowers, D., Duara, R., & Heilman, K. M. (1994). Apperceptive Visual Agnosia: A Case Study. Brain and Cognition, 25(1), 1-23. https://doi.org/10.1006/brcg.1994.1019

Apperceptive Visual Agnosia : A Case Study. / Shelton, P. A.; Bowers, D.; Duara, R.; Heilman, K. M.

In: Brain and Cognition, Vol. 25, No. 1, 01.05.1994, p. 1-23.

Research output: Contribution to journalArticle

Shelton, PA, Bowers, D, Duara, R & Heilman, KM 1994, 'Apperceptive Visual Agnosia: A Case Study', Brain and Cognition, vol. 25, no. 1, pp. 1-23. https://doi.org/10.1006/brcg.1994.1019
Shelton PA, Bowers D, Duara R, Heilman KM. Apperceptive Visual Agnosia: A Case Study. Brain and Cognition. 1994 May 1;25(1):1-23. https://doi.org/10.1006/brcg.1994.1019
Shelton, P. A. ; Bowers, D. ; Duara, R. ; Heilman, K. M. / Apperceptive Visual Agnosia : A Case Study. In: Brain and Cognition. 1994 ; Vol. 25, No. 1. pp. 1-23.
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