In this dissertation, I investigate how people navigate ambiguity in everyday speech, with a focus on quantifier-negation sentences. Combining corpus analysis, behavioral experiments, and computational modeling in the Rational Speech Act framework, I explore preferred interpretations of quantifier-negation and examine the contexts and prosodies…

Grounded in the biopsychosocial models of expressive language in autism spectrum disorder (ASD) and fragile X syndrome (FXS), this dissertation included two novel studies that examined the role of biological (i.e., physiology), psychological (i.e., autistic traits, anxiety symptoms, and child affect) and social (i.e., communication partner…

This mixed methods study draws upon theoretical perspectives from usage-based linguistics (UBL) and variationist sociolinguistics to explore four learners' use of second language (L2) Spanish present tense indicative verbal inflectional morphology (i.e., simple present conjugations). The study compares the frequency and distribution of students'…

It is standardly believed that some occurrences of expressions designate singularly, while other occurrences of expressions designate plurally. For instance, the singular expression the student may be used on an occasion to talk about one particular student, while the plural expression the students may be used on an occasion to talk about several…

This dissertation examines the question of how phonological alternations are learnt. In constraint-based models of phonological learning, it is hypothesized that prior learning of phonotactics from the lexicon facilitates the learning of alternations. While this is an influential assumption, the empirical evidence for it is equivocal. In this…

This dissertation explores parallels between Complementizer Phrase (CP) and Determiner Phrase (DP) semantics, syntax, and morphology--including similarities in case-assignment, subject-verb and possessor-possessum agreement, subject and possessor semantics, and overall syntactic structure--in first language acquisition. Applying theoretical…

Lexical categories like noun and verb are foundational to language acquisition, but these categories do not come neatly packaged for the infant language learner. Some have proposed that infants can begin to solve this problem by tracking the frequent nonadjacent word (or morpheme) contexts of these categories. However, nonadjacent relationships…

This dissertation is concerned with the specific relationship between copular sentences and existential sentences, and what about that relationship is responsible for the well-known restrictions on definiteness and predicates that are observed in the existential cases. Instead of starting with the well-known paradigms which illustrate restrictions…

Negation is a unique and fascinating property of human language which has been given extensive theoretical and typological treatment. One categorization divides negation use into metalinguistic negation and descriptive negation (Horn, 1985). Descriptive negation (DN) is the truth-functional semantic operator which has received the most attention…

There is an ongoing debate in the field of Second Language Acquisition concerning whether a fundamental difference exists between the native language (L1) and adult second language (L2) online processing of syntax and morpho-syntax. The Shallow Structure Hypothesis (SSH) (Clahsen and Felser, 2006a, b) states that L2 online parsing is qualitatively…

Morphological skills have been associated with performance on multiple literacy outcomes. While growth in derived word knowledge has been documented during mid-elementary grades, little research has studied the development of knowledge of specific morphemes, separate from whole-word knowledge. This study examined the development of knowledge of a…

Clause connectives are linguistic forms that convey relations between clauses in a sentence. They are typically compared, whether within a language or across languages, on the basis of a shared syntactic category, such as coordination and subordination, or a semantic one, such as sequence, cause, or addition. While the inadequacy of the…

Taking up analytical issues raised primarily in Dixon (2000) and Dixon & Aikhenvald (2000), this dissertation combines descriptive work with a medium-sized (50-language) typological study. Chapter 1 situates the dissertation against a concise survey of typological-functional work on causative constructions from the last few decades, and…

This thesis aims to examine the development of morphosyntax with longitudinal English production from Diany, a Mandarin-speaking child, starting from the second week Diany arrived in the U.S.A. (age 4;9). The study is particularly interested in whether Diany's acquisition of verbal morphemes and verb movement supports relevant hypotheses in the…

Despite substantial correlational evidence of a relationship between morphological awareness and reading ability, there has been only limited intervention research conducted to document the effects of morphological awareness on various literacy outcomes, particularly reading comprehension, and almost no research comparing the relative…