Experimental setting. Participants were seated in dimly lit room pressing with their right-hand on a home pad. They wore shutter glasses which could be switched from total blackness to transparent in order to permit selective vision of objects. Four objects were presented (2 large and 2 small). Participants were asked to perform one- or two-step movement after an auditory cue (a “go” signal), which was given 1200 ms after the shutter was switched to the transparent status. Only in the two-step trials were the participants instructed to grasp one of the objects. In the one-step trials the participants had to press a button in front of them in the presence of a non-action-related-object.