Chie Nakamura

Immediate Use of Prosody and Context in Predicting a Syntactic Structure.

Numerous studies have reported an effect of prosodic information on parsing but whether prosody can impact even the initial parsing decision is still not evident. In a visual world eye-tracking experiment, we investigated the influence of contrastive intonation and visual context on processing temporarily ambiguous relative clause sentences in Japanese. Our results showed that listeners used the prosodic cue to make a structural prediction before hearing disambiguating information. Importantly, the effect was limited to cases where the visual scene provided an appropriate context for the prosodic cue, thus eliminating the explanation that listeners have simply associated marked prosodic information with a less frequent structure. Furthermore, the influence of the prosodic information was also evident following disambiguating information, in a way that reflected the initial analysis. The current study demonstrates that prosody, when provided with an appropriate context, influences the initial syntactic analysis and also the subsequent cost at disambiguating information. The results also provide first evidence for pre-head structural prediction driven by prosodic and contextual information with a head-final construction.

Predicting the Unbeaten Path through Syntactic Priming.

A number of previous studies showed that comprehenders make use of lexically based constraints such as subcategorization frequency in processing structurally ambiguous sentences. One piece of such evidence is lexically specific syntactic priming in comprehension; following the costly processing of a temporarily ambiguous sentence, comprehenders experience less processing difficulty with the same structure with the same verb in subsequent processing. In previous studies using a reading paradigm, however, the effect was observed at or following disambiguating information and it is not known whether a priming effect affects only the process of resolving structural ambiguity following disambiguating input or it also affects the process before ambiguity is resolved. Using a visual world paradigm, the current study addressed this issue with Japanese relative clause sentences. Our results demonstrated that after experiencing the relative clause structure, comprehenders were more likely to predict the usually dispreferred structure immediately upon hearing the same verb. No compatible effect, in contrast, was observed on hearing a different verb. Our results are consistent with the constraint-based lexicalist view, which assumes the parallel activation of possible structural analyses at the verb. Our study demonstrated that an experience of a dispreferred structure activates the structural information in a lexically specific manner, leading comprehenders to predict another instance of the same structure on encountering the same verb.

Prosody helps L1 speakers but confuses L2 learners: Influence of L+H* pitch accent on referential ambiguity resolution

Numerous studies have reported an effect of prosodic information on initial parsing decision. However, whether prosody functions in the same way in adult second language (L2) sentence processing is not known. In visual world eyetracking experiments, we investigated the influence of contrastive intonation and visual context on processing locally ambiguous sentences with L1 speakers (native English speakers) and L2 learners (Japanese adult learners of English). Our results showed that referential visual context alone helped both L1 speakers and L2 learners to correctly analyze the sentence structure. Interestingly, however, the results also revealed that contrastive intonation accompanied by referential visual context facilitated the correct interpretation with L1 speakers but misled L2 learners “down a garden path”. L2 learners did not interpret the contrastive intonation as a cue that highlights a contrastive set in the visual scene. Instead, they interpreted the contrastive intonation as a simple emphasis and adopted the incorrect syntactic analysis.

It’s Harder to Break a Relationship When you Commit Long

Past research has produced evidence that parsing commitments strengthen over the processing of additional linguistic elements that are consistent with the commitments and undoing strong commitments takes more time than undoing weak commitments. It remains unclear, however, whether this so-called digging-in effect is exclusively due to the length of an ambiguous region or at least partly to the extra cost of processing these additional phrases. The current study addressed this issue by testing Japanese relative clause structure, where lexical content and sentence meaning were controlled for. The results showed evidence for a digging-in effect reflecting the strengthened commitment to an incorrect analysis caused by the processing of additional adjuncts. Our study provides strong support for the dynamical, self-organizing models of sentence processing but poses a problem for other models including serial two-stage models as well as frequency-based probabilistic models such as the surprisal theory.