Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
928949 | Human Movement Science | 2006 | 20 Pages |
This study extended earlier work by showing spatial assimilations in sequential bimanual and unimanual movements separated by 1.5–3.5 s. In Experiments 1 and 2, 30 right-handed participants (18–22 years of age) made rapid single and bimanual lever reversals of 20° and 60° assigned to 1.5, 2.5, or 3.5 s intermovement interval groups. Participants self-timed the intermovement interval in the first experiment, but it was provided in the second experiment using separate auditory stimuli. In the third experiment, participants performed both the 20° and 60° movement with the same hand. In all experiments, the shorter-distance limb overshot and the longer-distance limb undershot the targets in both bimanual and unimanual sequential movements relative to single movements in all three intermovement interval groups, particularly in the non-dominant left limb. The results suggest that assimilation effects in sequential movements are caused by command interactions at the planning level, but the effects are reduced by practice.