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 addition, the Group×Encoding Condition interactions revealed an interesting pattern: controls largely showed greater activity than schizophrenia participants during Intentional encoding in areas commonly associated with EM processing (Buckner et al., 2001; Otten et al., 2001).
Category: