…that relates the dependent variable (e.g., hand opening or pointing distance) to physical variations of the target sizes used in the experiment (Bruno & Franz, 2009; Dewar & Carey, 2006; Franz, 2003a,
2003b; Franz, Scharnowski, & Gegenfurtner, 2005; Glover & Dixon, 2002; Schenk et al., 2011).