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Yeou-Teh Liu, Tsung-Yu Hsieh and Karl M. Newell

Recent studies have shown more than one time scale of change in the movement dynamics of practice. Here, we decompose the drift and diffusion dynamics in adaptation to performing discrete aiming movements with different space-time constraints. Participants performed aiming movements on a graphics drawing board to a point target at 5 different space-time weightings on the task outcome. The drift was stronger the shorter the time constraint whereas noise was U-shaped across the space-time conditions. The drift and diffusion of adaptation in discrete aiming movements varied as a function of the space-time constraints on performance outcome and the spatial, temporal, or space-time measure of performance outcome. The findings support the postulation that the time scale of movement adaptation is task dependent.

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Rob Gray, Anders Orn and Tim Woodman

pitch velocity. The ANOVA performed on these data revealed no significant main effects or interactions, all p s > .05. To evaluate potential speed and accuracy trade-off effects, bivariate correlations between the mean number of targets hit and mean pitch velocity were calculated separately for the two