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Use of a Checkerboard Pattern Stimulus

Samuel Sokol, PhD

Arch Ophthalmol. 1972;88(6):619-624.

Abstract
Electrical signals from the retina and the visual cortex were recorded using a checkerboard pattern stimulus. The signals obtained from normal subjects indicate that, at the retinal level, both macular and nonmacular cones contribute to the electroretinogram (ERG). At the cortex, however, only macular cones are responsible for the electrical signal. Records obtained from a patient with macular degeneration show the absence of a visually evoked cortical potential (VECP).

Author Affiliations
Boston

From the Department of Ophthalmology, Tufts University School of Medicine, Boston.

Footnotes
Submitted for publication Feb 24, 1972.

Read in part before the Association for Research in Vision and Ophthalmology Sectional Meeting, Miami, Nov 5, 1971.

Reprint requests to the Department of Ophthalmology, Tufts University School of Medicine, Boston 02111 (Dr. Sokol).

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