Manual asymmetries in reaching movement control. II: Study of left-handers

Two experiments performed with left-handed subjects investigated how the ma nual asymmetries and hemispheric specialization involved in visuo-manual co ordination are associated with handedness. Pro and retroactive processes in volved in rapid movement control were analyzed according to the different m ovement parameters to be controlled, similar to studies performed with righ t-handers (Boulinguez, Nougier and Velay, 2001). Manual performances and ki nematic properties of reaching movements showed that the left and right han ds of left-handers behaved in the same way as the left and right hands of r ight-handers. Results are discussed in the light of the independence of han dedness and other forms of cerebral dominance in sensori-motor information processing involved in hand movements.