Visually guided exploration in Huntington disease

We compared 24 patients in various stages of Huntington disease (HD) with 2 6 control patients free from cerebral disorders using a simple visual sacca dic tracking test. The two groups were well matched in regard to age, sex, verbal IQ and years of schooling. Test results differed widely. On a time v ersus error plot, sensitivity (96%) and specificity (100%) were high and th e results did not depend on age, education, or disease duration, although a n influence of disease stage could be observed. This study shows that a sim ple saccadic tracking task may be useful in detecting visuomotor disturbanc es in HD.