Two visual systems in mental imagery
Dissociation of “what” and “where” in imagery disorders due to bilateral posterior cerebral lesions
Abstract
We studied two patients with impaired visual perception and imagery caused by bilateral posterior cerebral lesions. The first had prosopagnosia and achromatopsia, and the imagery disorder involved the description of objects from memory, especially faces and animals, and colors of objects. The second had visual disorientation; the imagery problem involved the description of spatial relations from memory. Impairments of visual imagery, like disorders of visual perception, can be dissociated. Object and color imagery may be dissociated from imagery for spatial relations. A given imagery deficit tends to be associated with the corresponding type of perceptual deficit.
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© 1985 by the American Academy of Neurology.
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Published online: July 1, 1985
Published in print: July 1985
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