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 fMRI paradigm used in the present study is directly analogous to the radial-arm maze task that was used originally to identify a specific role for the dorsolateral striatum (equivalent to the putamen in primates) in the formation of S-R associations in rodents [McDonald and Hong, 2004; Packard, 1999; Packard et al., 1989].
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