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:Our laboratory has previously demonstrated that responses to HDR appear to be independent of the influences of neck muscle afferents, baroreflexes, central command, visual input, and increased intracranial pressure (14, 25, 26, 34).
Category: