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:In using the report to categorize a participant’s attentional state in the 10–15 s immediately prior to the report, this methodology has been used to demonstrate reliable and replicable differences in neurocognitive functioning between on-task and mind wandering states (e.g., Christoff et al. 2009; Franklin et al. 2011; Kam et al. 2011, 2012, 2013; Kirschner et al. 2012; Mason et al. 2007; McKiernan et al. 2006; Smallwood et al. 2008a, b; Stawarczyk et al. 2011).
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