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:However, we did expect the manipulation to modulate the processing fluency of the metaphoric target sentences, so that the metaphoric target sentence would be processed more easily in the matched than in the mixed or literal contexts (Thibodeau & Durgin, 2008).
Category: