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:…of a variety of semantic phenomena, including semantic priming (Burgess, 1998; Jones, Kintsch, & Mewhort, 2006; Lowe & McDonald, 2000), word association (Griffiths et al., 2007; Sahlgren, 2006), and semantic categorization (Bullinaria & Levy, 2007; Burgess, 1998; Jankowicz, 2005; Laham, 2000).
Category: