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NEUROLOGY 1989;39:406
© 1989 American Academy of Neurology

The effect of bilateral visual cortex lesions on the development of eye movements and perception

Matthew Rizzo, MD and Richard Hurtig, PhD

Department of Neurology (Division of Behavioral Neurology and Cognitive Neuroscience), University of Iowa College of Medicine, Iowa City, IA. (Dr. Rizzo)
Department of Speech Pathology and Audiology, University of Iowa College of Medicine, Iowa City, IA. (Dr. Hurtig)

We studied the eye movements and visual perception in a man with extensive bilateral occipital lesions acquired at birth. He had 3/500 acuity, limited visual fields, and extrafoveal fixation attributable to an intact left superior visual cortex. Analysis of digitized electro-oculography and magnetic search coil data showed normal saccade dynamics. He could make voluntary saccades. Smooth pursuit of suprathreshold targets was mostly saccadic and did not improve with added nonvisual cues. Our results support the hypothesis that the visual cortex is crucial to the development of eye movements. The foveal representation in the occipital lobes, missing in this subject, is needed for development of normal smooth pursuit.

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

Supported by NINCDS Program Project # PO NS 19632.

Received January 25, 1988. Accepted for publication in final form September 7, 1988.






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