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 this experiment, we tested whether lexical competition as reflected in the Gender Number interaction is restricted to freestanding morphemes, as suggested by Schiller and Caramazza (2003), or whether it also occurs for bound morphemes like adjective inflections, as suggested by the results of Schriefers (1993). Participants produced noun phrases consisting of an adjective with a bound gender-marked suffix (exhibiting the same distributional properties over gender classes and number, singular vs.
Category: