Fig. 1.

Overview of the task. A: participants used a manipulandum to control a cursor in a 3-dimensional (3-D) virtual environment. The goal was to aim for a target region, projected on a virtual wall. One of 2 oblique targets was presented, oriented either 45 or 135 degrees from horizontal. B: participants move without the presence of a force field in the baseline block. A force field creating a perturbation along the vertical axis is turned on during the exposure block. Participants then complete 3 test blocks in which the force field is removed (catch trials) on 20% of the trials. The target rotated by 90 degrees for the final 3 test blocks (shaded region).