Initial Learning of Timing in Combined Serial Movements and a No-Movement Situation

We investigate differences in timing errors in a task that imitated the movement sequence of a cello player. We trained a group of 17 young adults to perform a sequence of linear reversal movements of different lengths but with a constant movement time. Thus, each segment required the movement speed to be changed. The sequence had to be performed with fluidity, except for a “no-movement” segment that was embedded in the movement series. Feedback on timing was given for each segment. Results from this experiment show that the no-movement segment is more variable than any of the movement segments. There was no significant correlation between the timing errors of the successive movements and the timing error of the pause. These results provide further evidence in favor of two distinct timing processes: one used for continuous movements and one used for no-movement and discontinuous movements.