title: Evaluation of cerebral dyschromatopsia using color afterimage.
abstract: Cerebral dyschromatopsia is traditionally evaluated by color discrimination tests such as the Farnsworth-Maunsell 100 Hue Test. These tests are also used to evaluate color-perception deficits caused by eye disease, and they do not tell us whether color perception is impaired in the eye or in the brain. Here, we used color afterimage to isolate color-perception deficits in the brain from those in the eyes, in a patient with cerebral dyschromatopsia. The results showed that the patient perceived color afterimage of yellow and blue with abnormal duration and chromaticity. On the other hand, the patient performed normally on the Farnsworth-Maunsell 100 Hue Test. We conclude that the color afterimage test would be useful to evaluate color perception in the brain.
authors.affiliation: Department of Neurology, Showa University School of Medicine, Japan. skoyama@med.showa-u.ac.jp
authors.forename: Shinichi
authors.initials: S
authors.lastname: Koyama
authors.forename: Machiko
authors.initials: M
authors.lastname: Kezuka
authors.forename: Haruo
authors.initials: H
authors.lastname: Hibino
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Tomimitsu
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Kawamura
mesh_terms: D003118:Color Perception / Q000502:physiology*; D003119:Color Perception Tests; D003117:Color Vision Defects / Q000209:etiology / Q000473:pathology / Q000503:physiopathology*; D004193:Discrimination Learning; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D009778:Occipital Lobe / Q000473:pathology / Q000503:physiopathology; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation; D020521:Stroke / Q000150:complications