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 presented stimulus information the participants in protocols 1 and 3 were told that it would be to their “advantage” to fixate centrally prior to the onset of the target as it would help to identify the location of the target more quickly (see also Tipper et al.1992; Welsh and Elliott 2004a).
Category: