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:Most studies focused on the relation between brain activation and motor function (Guzzetta et al. 2007; Staudt et al. 2002) or the effects of intervention on brain activation (Golomb et al. 2010; Sutcliffe et al. 2009; Walther et al. 2009; You et al. 2005; Cope et al. 2010).
Category: