Adaptive control of movement deceleration during saccades
Fig 5
Following experience of a single error, correction of the subsequent saccade was primarily during deceleration. A. Subjects made vertical saccades and occasionally experienced a horizontal error. B. Average horizontal and vertical velocity of the saccade for the target along the vertical axis. C. Trial-to-trial change in vertical and horizontal velocity following experience of a positive or negative horizontal endpoint error. Vertical line indicates time of peak speed, thus separating the acceleration and deceleration periods. D. Trial-to-trial change in saccade trajectory following experience of a positive or negative horizontal endpoint error. The endpoint correction was primarily due to commands in the deceleration period. Note the large difference in the scales of the x and y axes. E. Onset time of correction in the horizontal velocity following experience of a horizontal endpoint error. Mean onset time is about 3 ms following start of the deceleration period. F. Data from Experiments 1 and 2, measuring the response following the experience of error on the very first trial (velocity on trial 2 minus trial 1, in the direction of the perturbation). Shaded error regions are between subject SEM.