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:More recent investigations have shown that dyslexics have difficulty discriminating and processing both simple and complex rapid sound sequences (Hari and Kiesilä, 1996; Kujala et al., 2000; Renvall and Hari, 2002; Schulte- Körne, Deimel, Bartling, Remschmidt, 1998; Tallal, Miller, Jenkins, &…
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