Language disorder is characterized by difficulty with the comprehension and production of different aspects of language. School-aged children with developmental language disorder (DLD) and school-aged children with Down syndrome (DS) demonstrate similar deficits in the area of morphosyntax, which often creates barriers during social interactions…

When learning a language, typically-developing infants face the daunting task of learning both the sounds and the meanings of words. In this dissertation, we focus on a source of variability that complicates the one-to-one relationship between words and their meanings: wordform variability. In Chapter 1 we make a distinction between the micro…

Comprehenders encounter a variety of syntactic structures through reading or spoken conversation. In some cases, sentences can be ambiguous and have more than one meaning. In "The spy saw the cop with the binoculars," one interpretation is that the spy is looking through the binoculars, while an alternative is that the cop has the…

Languages tend to have three major clause types (declaratives, interrogatives, imperatives), dedicated to three main speech acts (assertions, questions, commands). However, the particular forms that these clause types take differ from language to language, and have to be learned. Previous experimental results suggest that by 18 months old,…

Purpose: Speech-language pathologists (SLPs) play an integral role in identification and treatment of developmental language disorders (DLD). Best practices include the use of language sample analysis (LSA) as part of a comprehensive evaluation. However, LSA requires a specific set of foundational morphological and syntactic knowledge. Previous…

How early do children produce multiword utterances? Do children's early utterances reflect abstract syntactic knowledge or are they the result of data-driven learning? We examine this issue through corpus analysis, computational modeling, and adult simulation experiments. Chapter 1 investigates when children start producing multiword utterances;…

Due in part to its complex nature, there is still much to uncover in the investigation of the neural processes that contribute to synchronization between speakers and listeners during communication in the context of social cognition, specifically between native and nonnative English speakers and listeners. This study used a novel method of…

The study and characterization of the literary uses of non-standard American English writing systems was once a topic of research central to the study of American literature. "Speech as Writing: Literary Dialect Orthography in the United States 1790-1930" argues that the emergence of new computational tools and theoretical insights…

Purpose: The purpose of this study is to explore the phonological development of Spanish-speaking preschoolers who are acquiring African American English (AAE) in North Carolina (NC). Understanding the phonological structure of the Spanish-AAE language combination will improve diagnostic accuracy for this group of children. Method: Four Black…

Singular "they" is becoming increasingly common and accepted, but many people find it difficult to learn, instead making seemingly-counterintuitive errors like "she uses they/them pronouns." Existing pronoun production models argue that speakers select pronouns based on morphosyntactic information associated with a name, or…

This dissertation investigates the wide-ranging implications of a simple fact: language unfolds over time. Whether as cognitive symbols in our minds, or as their physical realization in the world, if linguistic computations are not made over transient and shifting information as it occurs, they cannot be made at all. This dissertation explores the…

This study examines associations between writing instruction with a focus on explicit sentence syntax and reading comprehension in a sample of students receiving special education services. While the outcome data does not show direct causation between student enrollment in a treatment writing course using Systemic Functional Linguistics and…

The theory underlying L2 oral fluency has focused on cognitive processes, particularly proceduralization (Anderson, 1983; Levelt, 1989, 1999) and linguistic constructs, especially vocabulary and grammar (Segalowitz, 2010). Towell, Hawkins, and Bazergui (1996) argued that development of formulaic language enables automatic speech production.…

This dissertation investigates a typologically rare linguistic phenomenon found in Irish from three different perspectives: how it challenges phonological theory, how it is used by contemporary speakers, and how its written representation affects its acquisition. Initial consonant mutation (ICM), as it appears in the Celtic languages, is known to…

The objective of the current study is to contribute to the larger body of sociophonetic variation research by describing and analyzing Spanish as spoken in a small Puerto Rican community in the US. First, I describe phonological and morphosyntactic features of Spanish as used by four different groups of Puerto Rican informants in Amsterdam, New…