Modulation of the primary impulse of spatially-constrained video-aiming movements.
It has been suggested that temporally-constrained goal directed movements are based on a single submovement control strategy that could be modulated online. On the contrary, spatially-constrained movements might encourage participants to produce very fast, open-loop, but somewhat inaccurate/variable primary movement impulses and, if necessary, to perform a discrete correction. We wanted to determine whether the primary impulse of a spatially-constrained manual aiming movement was modulated online. On movement extent, results revealed that a first modulation mechanism acted soon after movement initiation. This modulation was largely independent of target size and apparently stabilized the output of the movement planning processes. A second modulation mechanism further reduced the variability of the movement's primary impulse so that movements ended on target. Movement direction appeared to be under continuous control.
Tinjust
David
D
Département de kinésiologie, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Québec, Canada H3C 3J7.
Proteau
Luc
L
D000328:Adult; D006801:Humans; D007721:Knowledge of Results, Psychological; D009068:Movement; D011930:Reaction Time; D013028:Space Perception; D013037:Spatial Behavior; D014584:User-Computer Interface; D014743:Videotape Recording; D055815:Young Adult