Eye-Hand Coordination in Patients with Parkinson’s Disease, Wilson’s Disease, Cerebellar Lesions, and Parietal Lesions

Coordinated eye and hand movements are successfully involved in many activities of human behavior. In order to execute concurrent or consecutive voluntary movements efficiently temporal and spatial coupling of the corresponding motor processes are required. A possibility to investigate interferences between both movements is the dual task methodology. Interference effects of eye and hand movements have been shown in experiments with aimed hand movements to randomized targets. Performing combined eye and hand reactions in dual task experiments, Warabi et al. (1986) have shown delayed saccadic reaction times (SRT), and Prablanc et al. (1979) reported delayed manual reaction times (MRT) compared to those in single task experiment. The reported interference effects support the hypothesis of neural processes shared by both motor systems. The kind of control processes and the involvement of distinct cerebral areas are partly known only.