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:The location of this plasticity is also consistent with previous functional imaging research showing cross-modal activity for visual motion stimuli in the right PTR (Cardin et al., 2013; Dewey and Hartley, 2015; Fine et al., 2005; Finney et al., 2001; Petitto et al., 2000; Sadato et al., 2005; Shiell et al., 2015a).
Category: