Experiment 2
Experiment 2 was designed to analyze rapid changes in feedback control strategies because of unexpected perturbations applied to the dominant and nondominant arms. Participants performed null field reaching movements with force field trials being randomly interspersed as catch trials. Participants performed the first block of 25 trials with no perturbation with each arm for a total of 50 trials (this block is named BL in the rest of the text). They then performed six blocks of 72 trials distributed as follows: 24 null field trials with each arm, six force field trials perturbed in the interior direction (clockwise force field for the left arm, and counterclockwise force field for the right arm) and six catch trials perturbed in the external direction (counterclockwise force field for the left arm and clockwise force field for the right arm). Catch trials occurred with a frequency of 1 catch trial for every four null field trials performed with each arm. The force field used during catch trials was of the same form as in experiment 1 with only the parameter 