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Brain, Vol. 110, No. 4, 869-886, 1987
© 1987 Guarantors of Brain

research-article

CHROMATICITY AND ACHROMATICITY

EVIDENCE FOR A FUNCTIONAL DIFFERENTIATION IN VISUAL FIELD DEFECTS

PETRA STOERIG

From the Institute of Medical Psychology, Munich Univeristy Munich, FRG

Correspondence to: Correspondence to: Dr Petra Stoerig, Institute of Medical Psychology, Munich University, Goethestrasse 31. 8 Munich 2, FRG.

In the visual field defects of 10 patients who had suffered lesions in the postgeniculate part of the primary visual projection, red-green discrimination and achromatic target detection was tested. In addition, 8 of these patients were tested for detection of red and green targets. Targets were presented on a low photopic achromatic background, so that the red and green targets differed from the background both in intensity and in wavelength, whereas the achromatic target differed in intensity only. Six patients showed evidence of discriminating between red and green targets, 5 patients could also detect the colour targets, but none could detect the achromatic one that was presented at the same retinal position. These results imply that wavelength and intensity information are treated differentially, and suggest that these patients possess residual colour-opponent channels that subserve the defective part of the visual field.

Received June 27, 1986. Revised October 3, 1986. Accepted October 14, 1986.


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