Manual and hemispatial asymmetries in visual aiming movements

Two distinct asymmetries are revealed in these experiments. The first is seen in the observation that movements with either hand were faster into ipsilateral hemispace. This hemispace effect was of equal magnitude for each hand, reflecting an asymmetry driven by the target's spatial location. The second, reflecting underlying differences in hand performance is seen in the right (preferred) hand advantage in movement execution, possibly reflecting the reduced time needed to process feedback information on approaching the target. (C) 1999 Academic Press.