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:…information, studies in awake behaving animals have shown only changes in the firing rate of Purkinje cells to be correlated with movementrelated parameters (Lisberger and Fuchs 1978; Mano and Yamamoto 1980; Medina and Lisberger 2007, 2008; Pasalar et al. 2006; Thach 1970; Yamamoto et al. 2007).
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