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This paper examines efficient predictive broadcoverage parsing without dynamic programming. In contrast to bottom-up methods, depth-first top-down paxsing produces partial parses that are fully connected trees spanning the entire left context, from which any kind of non-local dependency or partial semantic interpretation can in principle be read. We contrast two predictive parsing approaches, topdown and left-corner paxsing, and find both to be viable. In addition, we find that enhancement with non-local information not only improves parser accuracy, but also substantially improves the search efficiency.

This article addresses the question of how the processor decides on its initial strategy for syntactic ambiguity resolution. At a point of ambiguity, more than one analysis is possible. An effective strategy might be to adopt the analysis that has most frequently turned out to be correct in the past. Assuming that the world stays the same in most respects, the analysis that has most frequently been correct in the past should provide a good estimate of which analysis is most likely to be correct again. Hence, by adopting this analysis, the processor should make fewer errors than if it chose any other analysis

Two striking contrasts currently exist in the sentence processing literature. First, whereas adult readers rely heavily on lexical information in the generation of syntactic alternatives, adult listeners in world-situated eye-gaze studies appear to allow referential evidence to override strong countervailing lexical biases (Tanenhaus, Spivey-Knowlton, Eberhard, & Sedivy, 1995). Second, in contrast to adults, children in similar listening studies fail to use this referential information and appear to rely exclusively on verb biases or perhaps syntactically based parsing principles (Trueswell, Sekerina, Hill, & Logrip, 1999). We explore these contrasts by fully crossing verb bias and referential manipulations in a study using the eye-gaze listening technique with adults (Experiment 1) and Wve-year-olds (Experiment 2). Results indicate that adults combine lexical and referential information to determine syntactic choice. Children rely A portion of this work was presented in proceedings to the 23rd Annual Conference of the Cognitive Science Society. The ideas in this paper owe much to our conversations with Lila Gleitman and to the comments of the many audiences who heard preliminary reports of this research. We thank Kirsten Thorpe for her assistance with testing, coding, and participant recruitment and Sylvia Yuan for her assistance in data analysis. We also gratefully acknowledge Tracy Dardick who carried out the norming studies and Jared Novick and David January who assisted in comparisons between head-mounted eye-tracking and our procedure. This work was supported by NIH Grant 1-R01-HD37507 to the second author and a National Science Foundation Science and Technology grant to the Institute for Research in Cognitive Science at the University of Pennsylvania (NSF-STC Coo...

In 2 experiments, eye movements were monitored as participants followed instructions containing temporary syntactic ambiguities (e.g., “Pour the egg in the bowl over the flour”). The authors varied the affordances of task-relevant objects with respect to the action required by the instruction (e.g., whether 1 or both eggs in the visual workspace were in liquid form, allowing them to be poured). The number of candidate objects that could afford the action was found to determine whether listeners initially misinterpreted the ambiguous phrase (“in the bowl”) as specifying a location. The findings indicate that syntactic decisions are guided by the listener’s situation-specific evaluation of how to achieve the behavioral goal of an utterance. As a sentence unfolds in time, the grammatical relationships among its constituents are often temporarily ambiguous. For example, the phrase italicized in (1) may indicate the location where an egg is being poured, or may specify which of several eggs is intended. (1) The baker poured the egg in the bowl... (2) a....while stirring continuously.

This article presents two self-paced reading experiments which investigate the role of storage costs associated with maintaining incomplete syntactic dependencies in structural ambiguity resolution. We argue that previous work has been equivocal regarding syntactic influences because it has examined ambiguities where there is little or no resource differential between competing alternatives. The candidate structures of the ambiguities explored here incur substantially different storage costs. The results indicate that storage-based biases can be sufficiently powerful to create difficulty for a structural alternative even when it is promoted by nonsyntactic factors. These findings are incorporated into a model of ambiguity resolution in which structural biases operate as independent graded constraints in selecting between structural alternatives.

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To the extent that the human sentence processing mechanism attempts to assign a structure and an interpretation to incoming material word-by-word as soon as it is encountered, one can ask how it decides which structure to assign upon encountering a partial sentence like "The spy saw the cop with": which attachment will it choose for the PP containing "with"? That is the question I explore in this paper.

Two experiments are reported examining the relationship between lexical and syntactic processing during language comprehension, combining techniques common to the on-line study of syntactic ambiguity resolution with priming techniques common to the study of lexical processing. By manipulating grammatical properties of lexical primes, we explore how lexically based knowledge is activated and guides combinatory sentence processing. Particularly, we find that nouns (like verbs, see Trueswell & Kim, 1998) can activate detailed lexically specific syntactic information and that these representations guide the resolution of relevant syntactic ambiguities pertaining to verb argument structure. These findings suggest that certain principles of knowledge representation common to theories of lexical knowledge—such as overlapping and distributed representations—also characterize grammatical knowledge. Additionally, observations from an auditory comprehension study suggest similar conclusions about the lexical nature of parsing in spoken language comprehension. They also suggest that thematic role and syntactic preferences are activated during word recognition and that both influence combinatory processing. KEY WORDS: On-line language comprehension; grammatical knowledge; lexical priming; word recognition; syntactic processing; parsing.