Two distinct asymmetries are revealed in these experiments. The first is se
en in the observation that movements with either hand were faster into ipsi
lateral hemispace. This hemispace effect was of equal magnitude for each ha
nd, reflecting an asymmetry driven by the target's spatial location. The se
cond, 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.