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:We targeted the right auditory cortex because previous studies reported selectively right-sided activity in the superior temporal gyrus during timing tasks (e.g., Coull et al. 2004; Rao et al. 1997; Coull et al. 2008).
Category: