Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:…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).
Category: