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:Still, we often read ‘‘we observed a specialization of the face-processing system, as shown by the loss of ability to discriminate between faces from other species’’ (see Pascalis et al., 2005, p. 5300; emphasis added).
Category: