Left- and right-handers distribute their attention asymmetrically on stimulus-response compatibility tasks
Subgroups of left- and right-handers completed three stimulus-response compatibility experiments to investigate the relation between hand preference and performance. Although each handedness group demonstrated Simon effects in all three experiments, the performance patterns of four theoretically distinct handedness groups were dissimilar. The differences between the two subgroups of left-handers, however, were much less subtle than they were between the two subgroups of right-handers. The results suggest that subjects distributed their attention asymmetrically on these stimulus-response compatibility tasks. Furthermore, the direction of the attentional asymmetry was not always in accordance with the writing hand. Attentional precues altered the magnitude, and sometimes the direction, of the attentional asymmetries.