Evidence from 3 experiments reveals interference effects from structural relationships that are inconsistent with any grammatical parse of the perceived input. Processing disruption was observed when items occurring between a head and a dependent overlapped with either (or both) syntactic or semantic features of the dependent. Effects of syntactic interference occur in the earliest online measures in the region where the retrieval of a long-distance dependent occurs. Semantic interference effects occur in later online measures at the end of the sentence. Both effects endure in offline comprehension measures, suggesting that interfering items participate in incorrect interpretations that resist reanalysis. The data are discussed in terms of a cue-based retrieval account of parsing, which reconciles the fact that the parser must violate the grammar in order for these interference effects to occur. Broader implications of this research indicate a need for a precise specification of the interface between the parsing mechanism and the memory system that supports language comprehension.Keywords cue-based memory retrieval; interference; complexity effects; sentence processing; constraint-based parsing Interference effects in sentence processing are beginning to be recognized, but the conditions that give rise to these effects are not well understood (Gordon, Hendrick, & Johnson, 2001, 2004Van Dyke & Lewis, 2003;Van Dyke & McElree, 2006). colleagues (2001, 2004) observed that the classic processing advantage for subject-relative clauses over objectrelative clauses was reduced or eliminated when the second noun phrase (NP) in sentences such as 1a and 1b was either a pronoun (you or everyone) or a proper name (Joe). They attributed their result to a reduction in similarity-based interference that occurs when the two NPs have different referential characteristics (i.e., common NPs refer via their description; pronouns and proper names refer directly to objects previously established in the discourse). Thus, on this account, interference effects are due to the presence of NPs with shared referential characteristics.(1a) The banker that praised [the barber/a barber/Joe/you/everyone] climbed the mountain.(1b) The banker that [the barber/a barber/Joe/you/everyone] praised climbed the mountain.Several researchers have suggested an alternative account, one that implicates retrieval as the source of interference effects (Lewis, Vasishth, & Van Dyke, 2006;McElree, Foraker, & Dyer, 2003;Van Dyke, 2002;Van Dyke & Lewis, 2003;Van Dyke & McElree, 2006). Although these are not the first sentence-processing theories to include a retrieval component, previous theories (e.g., Gibson, 1998Gibson, ,2000 have emphasized decay as the source of processing complexity, on Correspondence concerning this article should be addressed to Julie A. Van
NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author Manuscript the basis of hypothesized memory demands that certain structures present for comprehenders. In contrast, approaches...