Abstract
Agreement is one of the main devices used by languages to signal grammatical relations. In this study, we investigated the neurophysiological processing correlates of subject-verb agreement in Spanish using Unagreement, a phenomenon characterized by a person mismatch between subject and verb that nonetheless produces a grammatical pattern. Unagreement was compared to well-formed sentences with full agreement, and ill-formed sentences with a person mismatch. Compared to control sentences, Unagreement produced a left posterior negativity followed by a more central negativity; no P600 effect was observed. In contrast, person violations generated a negativity that was widely distributed over the scalp, followed by a P600 effect. These data suggest that the comprehension of qualitatively different agreement patterns, which could reflect the performance of different processing routines, recruits different neural generators.
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