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:‚Ä¶eVects of gravity
 The results of this experiment are consistent with the hypothesis that human observers apply a simpliWed model of gravity when predicting the vertical movements of an object (McIntyre et al. 2001; Senot et al. 2005; Zago and Lacquaniti 2005; Zago et al. 2004, 2005, 2008, 2009).
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