Figure 2. Setup. a, Example sequence of two trials (direction of the arrow, 45°). b, Participants laid in the scanner with the index finger on the center of a device attached to their chest and executed a reaching movement on the device in the direction indicated by the arrow on the screen. The straight arrow illustrates the direction of the movement to be performed on the device (in this example, 45°; arrow on the device not shown during the experiment). In experiment 1, participants used their right hand, and in experiment 2, participants used their left hand. c, On the schematic device, the full set of test directions is shown for adaptation direction 45°, indicated by the straight arrow. On each target half-sphere, the angular difference between adaptation and test direction and the corresponding label are indicated. The broken arrow indicates adaptation direction 225°, used in separate blocks.