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:Furthermore, while the N400 event-related potential (ERP) is known to modulated by various semantic effects (Holcomb and Neville, 1990; Kutas and Hillyard, 1980, 1984), our results suggest that earlier components (possibly as early as 200‚Äì300 ms) may also contribute to the encoding of object‚Ä¶
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