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:As in previous studies [30,31,43,44,45,46,47], context was enforced using a strong visual cue, with the two separate word lists each being associated with a different detailed visual poster in front of participants, with the instruction for participants to associate each word on the screen with the poster in front of them.
Category: