The time-course of prediction in incremental sentence processing: Evidence from anticipatory eye movements

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Abstract

Three eye-tracking experiments using the ‘visual-world’ paradigm are described that explore the basis by which thematic dependencies can be evaluated in advance of linguistic input that unambiguously signals those dependencies. Following Altmann and Kamide (1999), who found that selectional information conveyed by a verb can be used to anticipate an upcoming Theme, we attempt to draw here a more precise picture of the basis for such anticipatory processing. Our data from two studies in English and one in Japanese suggest that (a) verb-based information is not limited to anticipating the immediately following (grammatical) object, but can also anticipate later occurring objects (e.g., Goals), (b) in combination with information conveyed by the verb, a pre-verbal argument (Agent) can constrain the anticipation of a subsequent Theme, and (c) in a head-final construction such as that typically found in Japanese, both syntactic and semantic constraints extracted from pre-verbal arguments can enable the anticipation, in effect, of a further forthcoming argument in the absence of their head (the verb). We suggest that such processing is the hallmark of an incremental processor that is able to draw on different sources of information (some non-linguistic) at the earliest possible opportunity to establish the fullest possible interpretation of the input at each moment in time.

Section snippets

Experiment 1

In this experiment, we consider the processing of 3-place verbs, as in

  • (1)

    The woman will spread the butter on the bread.

  • (2)

    The woman will slide the butter to the man.

The verbs spread and slide subcategorize for up to two post-verbal arguments. At issue is whether the processor anticipates, either at the verb or during the first post-verbal argument (the Theme), information pertaining to the second post-verbal argument (the Goal). This study is analogous to the Altmann (1999) experiment, except that,

Discussion

The data demonstrate that during the immediately post-verbal referring expression (during ‘the butter_’—between the onset of the determiner and the onset of the subsequent preposition), there are more anticipatory eye movements towards the appropriate Goal object than towards the inappropriate Goal object. Given the 200 ms generally assumed necessary for programming and initiating an eye movement (e.g., Matin, Shao, & Boff, 1993; Saslow, 1967), these anticipatory eye movements must have been

Experiment 2

Experiment 1 and the Altmann and Kamide (1999) study explored whether one or other of a verb’s internal arguments can be anticipated on the basis of information accessed at the verb. Experiment 2 aims to extend these basic findings: In principle, the anticipatory effects reported in Altmann and Kamide (1999) and observed also in Experiment 1 here could have been driven solely by lexical information retrieved at the verb. Alternatively, information from the verb could be combined with

Experiment 3

In Japanese, all arguments of the verb appear prior to the verb. For example, consider the following example:

  • (7)

    syoojo-ga neko-ni sakana-o yatta.

    girl-nominative cat-dative fish-accusative gave.

    The girl gave the fish to the cat.

In (7), all three of the verb’s arguments come before the verb, and as is typical with head-final languages, each argument is case-marked (in Japanese, the case-marking is not a nominal inflection but rather a post-nominal particle). If verb’s are the driving force behind

General discussion

The primary issue in the present paper has been whether preceding linguistic input can provide the basis for the processor to anticipate upcoming input, and if so, what kinds of information provided by that preceding input provide that basis. Previously, we have shown that selectional restrictions can be used to predict the semantic properties of whatever will be referred to post-verbally (with the assumption that the processor predicts that something will be referred to post-verbally on the

Acknowledgements

We are grateful also to Vicki White, Lynne Weighall, and Matt Smelt-Webb for helping us recruit the participants in the experiments reported here. Also, we appreciate very helpful comments from Rick Lewis, and two anonymous reviewers given to earlier versions of the draft. The present research was supported by grants to GTMA from the Medical Research Council (G9628472N and G0000224), the Economic and Social Research Council (R000222798), and the Royal Society.

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