Fig. 4.

Handedness and the spatial modulation of drift. For both left-handers (top row) and right-handers (bottom row), we found there was generally more drift when an arm was in its habitual action space, i.e., near the left shoulder when the RHI was induced on the left hand, and near the right shoulder for the right hand. For both handedness groups, we found a significant linear effect of drift only for the dominant hand (a, d), but not for the non-dominant hands (b, c). Pos. 1 shoulder out, pos. 2 shoulder in, pos. 3 midline, pos. 4 x-midline—where the shoulder refers to the shoulder of the corresponding hand’s arm (please see in text for more details)