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Two visual systems in mental imagery

Dissociation of "what" and "where" in imagery disorders due to bilateral posterior cerebral lesions

From Neurology Services, Spaulding Rehabilitation Hospital and Massachusetts General Hospital, and the Department of Neurology, Harvard Medical School (Drs. Levine and Warach), Boston, MA; and the Department of Psychology (Dr. Farah), Carnegie-Mellon University, Pittsburgh, PA.

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.

Address correspondence and reprint requests to Dr. Levine. Massarhusetts General Hospital, Burnham 802, Boston, MA 02114.

Accepted for publication November 9, 1984.

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