Fig 1. Schematic of the apparatus, side (A) and top view (B), (C).

(A) Participants sat in front of the apparatus with their head fixed by a bite bar (not shown). They reached from one of three reach starts locations (black circles) to one of two targets (red cubes) while fixating one of seven LEDs (green circles). In the experiment, reach starts were marked by half-circled felt shapes attached on top of the horizontally mounted touch screen. The tactors (not shown) used to present mechanical touches and the LEDs used to vary gaze were each fixed in a metal plate under the touch screen. The index and ring finger of the left hand were kept in a slider (see (B)) that could be moved in the sagittal dimension and placed the fingers under the tactors. Black foil under the touch screen prevented seeing through the transparent touch screen. (B) and (C) Participants moved the slider between an endpoint near to (red rectangle at the bottom of the panel) and far from (red rectangle in the upper part) their body as shown here in a top view of the setup. Contact with the endpoints of a rail was signaled by mouse clicks. Panel (B) shows the slider at the position far from the body and panel (C) shows it at the position close to the body. In the moved-online-far condition, the tactors and LEDs were shifted to the near end of the touchscreen (not shown).