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:…target sentences more fluently in the matched than in the mixed or literal contexts, which is consistent with prior work on the role of context in metaphor processing (Gerrig & Healy, 1983; Gibbs & Gerrig, 1989; Giora, 2003; Nayak & Gibbs, 1990; Ortony et al., 1978; Thibodeau & Durgin, 2008).
Category: