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Cortical blindness and visual imagery

From the Department of Neurology and the Alzheimer's Disease Center (Dr. Chatterjee) and the Department of Biocommunication (Dr. Southwood), University of Alabama at Birmingham, AL.
A.C. was supported by NIH-NINDS Clinical Investigator Development Award 1KO8NS01702-01.
Received February 7, 1995. Accepted in final form April 4, 1995.
Address correspondence and reprint requests to Dr. Anjan Chatterjee, UAB Neurology, 454 Sparks Center, 1720 7th Avenue South, Birmingham, AL 35294.

Controversy exists concerning the neural basis underlying visual imagery.Some propose that visual images evoked from memory are mediated by primary visual cortices. Others argue that these primary visual areas perform computations on elementary visual features when constructing visual representations from retinal input but that they are not activated during recall of these representations. The visual imagery abilities of patients with cortical blindness may resolve this controversy. The proposition that primary visual cortex is necessary for visual imagery predicts that a cortically blind subject's inability to perceive visual stimuli would be accompanied by an inability to image visually. Our investigations of three patients with cortical blindness provide strong evidence that primary visual cortices are not essential for the mediation of visual images recalled from memory.

NEUROLOGY 1995;45: 2189-2195

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