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 current results, along with several other studies (e.g., Kelly et al., 2007; Pascalis et al., 2002; Pascalis et al., 2005; Werker & Tees, 1984; Werker et al., 1981), demonstrate that human infants’ perceptual systems do become attuned to their environment.
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