Figure 1.

The experimental setup showing (top) the 3-wall mounted infrared motion capture cameras (Qualisys) triangulating the (bottom) black workspace table from above. On this, the start button is in the foreground, with the “large” object shown at a “near, midline” location; the “small” object at an “ipsi, far” location (for a right-handed subject); and the neutral object used only for practice at a “contra, far” location. The locations shown were used for children with arm lengths ≥35 cm; blue stickers indicate those used for subjects with shorter arms.