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Looking but not seeing

Attention, perception, and eye movements in simultanagnosia

From the Departments of Neurology (Division of Behavioral Ncurology) (Dr. Rizzo) and Speech Patbohgy (Dr. Hurtig), University of Iowa College of Medicine, Iowa City, IA.

We studied three subjecta who reported the apparent "disappearance" of stationary objecte from direct view. They had simultanagnosia caused by CT-verified bilateral superior occipital lobe lesions. They had no abnormalities of visual acuity or fields to explain their defect. EOG with computer analysis showed intact motility andecanning. Most important, the subjecta reported intermittent disappearance of a light target during Em-verified fixation-ie, they were looking 6ut not seeing. Results indicate that attention mechanisms that permit sustained awareness of visual targets depend on the superior visual association cortices and are relatively separate from mechanisms that shift gaze and drive visual search.

Address correspondence and reprint requests to Dr. Rizzo, Dapartment of Neurology, University of Iowa, Iowa City, IA 52242.

Supported by NINCDS Program Project Grant #PO NS 19632.

Received September 19, 1986. Accepted for publication in final form January 14, 1987.

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