Duane G. Watson

The relationship between intonational phrasing and syntactic structure in language production

In this paper, we evaluate several theories of how syntactic/semantic structure influences the placement of intonational boundaries in language production (Cooper & Paccia-Cooper, 1980; Gee & Grosjean, 1983; Ferreira, 1988). Although the theories that we tested are shown to be quite successful, they are complex, and furthermore, they are incompatible with recent evidence for incrementality in sentence production. In light of these problems, we propose a simpler incremental model called the Left hand side/Right hand side Boundary hypothesis (LRB). According to this hypothesis, two factors that underlie the successful performance of the algorithms from the literature contribute to the likelihood of producing intonational boundaries at word boundaries: (1) the size of the recently completed syntactic constituent at a word boundary; and (2) the size of the upcoming syntactic constituent. These factors are further constrained by syntactic argument relationships. We demonstrate that the LRB performs as well as previous models with respect to the data from Experiment 1. In Experiment 2, we present evidence that the LRB outperforms previous models in certain instances. In Experiment 3, we demonstrate that the discourse status of relative clauses is an additional factor in intonational boundary placement.

Experimental and theoretical advances in prosody: A review

Research on prosody has recently become an important focus in various disciplines, including Linguistics, Psychology, and Computer Science. This article reviews recent research advances on two key issues: prosodic phrasing and prosodic prominence. Both aspects of prosody are influenced by linguistic factors such as syntactic constituent structure, semantic relations, phonological rhythm, pragmatic considerations, and also by processing factors such as the length, complexity, or predictability of linguistic material. Our review summarises recent insights into the production and perception of these two components of prosody and their grammatical underpinnings. While this review only covers a subset of a broader set of research topics on prosody in cognitive science, these topics are representative of a tendency in the field towards a more interdisciplinary approach.

Reading relative clauses in English

Abstract Two self-paced reading experiments investigated several factors that influence the comprehension complexity of singly-embedded relative clauses (RCs) in English. Three factors were manipulated in Experiment 1, resulting in three main effects. First, object-extracted RCs were read more slowly than subject-extracted RCs, replicating previous work. Second, RCs that were embedded within the sentential complement of a noun were read more slowly than comparable RCs that were not embedded in this way. Third, and most interestingly, object-modifying RCs were read more slowly than subject-modifying relative clauses. This result contradicts one of the central tenets of complexity research: that nested sentences are harder to understand than their right-branching equivalents (e.g., Miller and Chomsky 1963). It is hypothesized that this result followed from a combination of two information-flow factors: (1) background information is usually presented early in a sentence; and (2) restrictive RCs—the form of the RCs in Experiment 1—usually convey background information. Experiment 2 tested this hypothesis by comparing restrictive and non-restrictive RCs— which generally provide new information—in both subject- and objectmodifying positions. The results of the experiment were as predicted by the information-flow account: Only restrictive RCs were read more slowly when modifying objects. It is concluded that both resource and information-flow factors need to be considered in explaining RC complexity effects.

Interpreting Pitch Accents in Online Comprehension: H ∗ vs. L+H ∗

Although the presence or absence of a pitch accent clearly can play an important role in signaling the discourse and information structure of an utterance, whether the form of an accent determines the type of information it conveys is more controversial. We used an eye-tracking paradigm to investigate whether H*, which has been argued to signal new information, evokes different eye fixations than L+H*, which has been argued to signal the presence of contrast. Our results demonstrate that although listeners interpret these accents differently, their interpretive domains overlap. L+H* creates a strong bias toward contrast referents whereas H* is compatible with both new and contrast referents.

An acoustic analysis of prosody in high-functioning autism

This paper examined the fundamental frequency variation in the narratives of individuals with high-functioning autism (HFA) and typical controls matched on age, IQ, and verbal abilities. Study 1 found increased fundamental frequency variation in the speech of 21 children and adolescents with HFA when compared to 21 typical controls. Study 2 replicated the findings from Study 1 with a younger sample of 17 children with HFA and 17 typical controls. In addition, Study 1 found evidence that acoustic measurements of prosody were related to clinical judgments of autism-specific communication impairments, although this was not replicated in Study 2. Taken together, these studies provide evidence for differences in expressive prosody in individuals with HFA that can be measured objectively.

Tic Tac TOE: Effects of predictability and importance on acoustic prominence in language production☆☆☆

Importance and predictability each have been argued to contribute to acoustic prominence. To investigate whether these factors are independent or two aspects of the same phenomenon, naïve participants played a verbal variant of Tic Tac Toe. Both importance and predictability contributed independently to the acoustic prominence of a word, but in different ways. Predictable game moves were shorter in duration and had less pitch excursion than less predictable game moves, whereas intensity was higher for important game moves. These data also suggest that acoustic prominence is affected by both speaker-centered processes (speaker effort) and listener-centered processes (intent to signal important information to the listener).

Repetition Is Easy: Why Repeated Referents Have Reduced Prominence

The repetition and the predictability of a word in a conversation are two factors that are believed to affect whether it is emphasized: Predictable, repeated words are less acoustically prominent than unpredictable, new words. However, because predictability and repetition are correlated, it is unclear whether speakers lengthen unpredictable words to facilitate comprehension or whether this lengthening is the result of difficulties in accessing a new (nonrepeated) lexical item. In this study, we investigated the relationship between acoustic prominence, repetition, and predictability in a description task. In Experiment 1, we found that repeated referents are produced with reduced prominence, even when these referents are unexpected. In Experiment 2, we found that predictability and repetition both have independent effects on duration and intensity. However, word duration was primarily determined by repetition, and intensity was primarily determined by predictability. The results are most consistent with an account in which multiple cognitive factors influence the acoustic prominence of a word.

Resolving ambiguity: A psycholinguistic approach to understanding prosody processing in high-functioning autism

Individuals with autism exhibit significant impairments in prosody production, yet there is a paucity of research on prosody comprehension in this population. The current study adapted a psycholinguistic paradigm to examine whether individuals with autism are able to use prosody to resolve syntactically ambiguous sentences. Participants were 21 adolescents with high-functioning autism (HFA), and 22 typically developing controls matched on age, IQ, receptive language, and gender. The HFA group was significantly less likely to use prosody to disambiguate syntax, but scored comparably to controls when syntax alone or both prosody and syntax indicated the correct response. These findings indicate that adolescents with HFA have difficulty using prosody to disambiguate syntax in comparison to typically developing controls, even when matched on chronological age, IQ, and receptive language. The implications of these findings for how individuals with autism process language are discussed.

The influence of contextual contrast on syntactic processing: evidence for strong-interaction in sentence comprehension

The present study compares the processing of unambiguous restrictive and non-restrictive relative clauses (RCs) within both a null context and a supportive discourse using a self-paced reading methodology. Individuals read restrictive RCs more slowly than non-restrictive RCs in a null context, but processed restrictive RCs faster than non-restrictive RCs in supportive context, resulting in an interaction between context and RC type. These results provide evidence for two theoretical points. First, principles analogous to those in referential theory [Altmann G. T. M., & Steedman, M. (1988). Interaction with context during human sentence processing. Cognition, 30, 191-238; Crain, S., & Steedman, M. (1985). On not being led up the garden path: The use of context by the psychological parser. In D. Dowty, L. Karttunnen, A. Zwicky (Eds.), Natural language parsing. Cambridge, UK: Cambridge University Press] apply not only in resolving ambiguity but also in processing unambiguous sentences. Second, the discourse context can guide and facilitate interpretive processing. This result suggests that intrasentential factors such as syntax are not autonomous from contextual processing, contrary to the modularity hypothesis [Fodor, J. A. (1983). Modularity of mind. Cambridge, MA: MIT Press].

The Many Roads to Prominence: Understanding Emphasis in Conversation

Abstract Traditionally, it has been assumed that emphasis is used to signal that information in a conversation is new, focused, or important. In this chapter, evidence from three sets of experiments suggests that emphasis is the product of a number of different factors that can affect the acoustic prominence of a word in different ways. I present evidence that (1) emphasis can vary continuously, not categorically; (2) differing factors like difficulty of production and informational importance have different effects on how emphasis is acoustically realized; and (3) listeners do not treat all acoustic correlates of emphasis equally when processing speech, suggesting that they are sensitive to the fact that emphasis is the product of multiple sources. These findings suggest that rather than being a unitary linguistic or psychological construct, emphasis is the product of an array of different cognitive and linguistic factors.Traditionally, it has been assumed that emphasis is used to signal that information in a conversation is new, focused, or important. In this chapter, evidence from three sets of experiments suggests that emphasis is the product of a number of different factors that can affect the acoustic prominence of a word in different ways. I present evidence that (1) emphasis can vary continuously, not categorically; (2) differing factors like difficulty of production and informational importance have different effects on how emphasis is acoustically realized; and (3) listeners do not treat all acoustic correlates of emphasis equally when processing speech, suggesting that they are sensitive to the fact that emphasis is the product of multiple sources. These findings suggest that rather than being a unitary linguistic or psychological construct, emphasis is the product of an array of different cognitive and linguistic factors.