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 also investigate the network implementation of the three decoding methods, following the idea of Pouget et al. (Deneve, Latham, & Pouget, 1999; Pouget & Zhang, 1997; Pouget et al., 1998).
Category: