Figure 1.

Full apparatus setup. The MR-safe writing tablet (Tam et al., 2011), arm pillow, and Wheaton elastic shoulder immobilizer were adjusted for each participant. Participant-specific adjustments ensured that the participants were in a comfortable writing position. Before the experiment began, an experimenter positioned their hand in an appropriate position so that they could feel where their wrist laid on the apparatus. Care was taken to instruct the participants to keep their hand toward the center of the screen.