Figure 2.

Materials and methods. (A) A transparent mirror divided the experimental apparatus into two compartments, one with a bar visible to the subject (visible object), and one with an invisible bar that could be reached by the subject's right hand (haptic object). The haptic object was painted black and never illuminated. (B,C,) Single trial showing the coordinates of the reflex markers, the calculated grip aperture, and the XY plot of the digit movements. (D) All experimental series began with nine trials with equal visual and haptic size, followed by 23 trials with haptic size of either 15 mm larger or smaller than the visual size; each series ended with 16 trials with equal visual and haptic size. (E) Visual and haptic objects drawn to scale.