“…Actions like crawling, walking, turning, poking, and grasping cause specific changes in the sensory signals of the actor, and these causal relationships can be learned. Several authors suggested that these learned relationships are the basis of certain perceptual qualities, like understanding the spatial arrangement of obstacles, the function of tools, and the material properties of objects (Möller, 1996(Möller, , 1999Gross et al, 1999;O'Regan and Noë, 2001;Grush, 2004;Hoffmann and Möller, 2004).…”