Vision and laterality: Does occlusion disclose a feedback processing advantage for the right hand system?

The main purpose of this study was to examine whether manual asymmetries co uld be related to the superiority of the left hemisphere/right hand system in processing visual feedback. Subjects were tested when performing single (Experiment 1) and reciprocal (Experiment 2) aiming movements under differe nt vision conditions (full vision, 20 ms on/180 ms off, 10/90, 40/160, 20/8 0, 60/120, 20/40). Although in both experiments right hand advantages were found, manual asymmetries did not interact with intermittent vision conditi ons. Similar patterns of results were found across vision conditions for bo th hands. These data do not support the visual feedback processing hypothes is of manual asymmetry. Motor performance is affected to the same extent fo r both hand systems when vision is degraded.