“…That is to say, this ERP effect is not the sole ''representative'' of referential problems in general. ERP studies investigating other referential aspects of language comprehension (e.g., Nieuwland & Van Berkum, 2006a;Van Berkum et al, 2004, in press;Anderson & Holcomb, 2005;Swaab, Camblin, & Gordon, 2004;Harris, Wexler, & Holcomb, 2000;Streb, Rosler, & Hennighausen, 1999;Osterhout & Mobley, 1995) suggest that different referential ''problems'' (e.g., nonparallel discourse structures, referential failure, synonymy) may elicit ERP effects that are typically associated with semantic or syntactic problems (e.g., N400 or P600). Perhaps because establishing reference is intricately intertwined with phonological, syntactic, and semantic levels of linguistic representation, referential problems may sometimes affect the analysis at other levels and become manifest as such (see Van Berkum et al, in press, for a discussion).…”