[Optic ataxia: analysis of eye and hand responses in pointing at visual targets (author's transl)]

A visuomotor task was used in three cases of isolated optic ataxia, in patients with an unilateral parietal lesion (one right and two left). Eye and hand movements were recorded in pointing at visual targets in a closed loop condition. Saccades directed to the contralateral side were abnormal in two patients. Hand pointing was always accurate in foveal vision conditions. Errors observed in peripheral vision condition were different according to the side of the lesion. The contribution of oculomotor signals in optic ataxia and the influence of hemispheric specialization are discussed.