How do infants learn about the formal properties of language using only cues they can access in speech? And what intuitions do they bring to the learning problem? Chapter 2: To explore whether current notions of statistically-based language learning could successfully scale to infants' linguistic experiences "in the wild", we implemented…

Code-switching (switching between languages) is a common linguistic behavior in bilingual speech directed to infants and children. In adult-directed speech (ADS), acoustic-phonetic properties of one language may transfer to the other language close to a code-switch point; for example, English stop consonants may be more Spanish-like near a switch.…

Multiple domains develop simultaneously and interact throughout infancy and early childhood. Although relationships between motor and language skills have been examined cross-sectionally during the first three years of life, little is known regarding the individual factors that influence the development of these domains as well as the relationship…

The problem addressed by this study was children's impeded oral language development when parents do not engage them in frequent conversational exchanges during the infant and toddler years. The purpose of the study was to explore parent behaviors and perceptions. Two questions guided the study: when do parents talk with their children? and how do…

Infants are born highly sensitive to the natural patterns found in languages. They use their perceptual sensitivity to acquire detailed information about the structure of languages in their environment. To date, most studies of infant perception and early language acquisition have investigated spoken/auditory languages and hearing infants (e.g.…

Infancy is a period of significant change for both the brain and behavior. During the first two years of life, the brain experiences an explosion of synaptic connections and myelination, alongside rapid development in motor, linguistic, and social behavioral abilities. Understanding the relationship between brain development and behavioral…

Infants and toddlers experience the world in interaction with others. Likewise, social interactions are important in learning about math--concepts of number ("one," "two," "three"), space ("on top," "upside-down," "round"), and magnitude ("more," "big,"…

This dissertation investigated the caregiving relationships between infants and nonparental caregivers in early childcare settings through the lens of attachment and language behaviors. This study sought to provide an opportunity to extend our understanding of the socioemotional factors that influence children's development in their daily lives.…

This dissertation presents behavioral studies that target the early syntactic representations of "wh"-movement during infancy and early childhood. Previous studies show that by 20 months-old, infants represent "wh"-movement and use this knowledge to respond to "wh"-questions during language comprehension tasks…

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…

Animals have long been used as comparative models for adult human speech perception. However, few animal models have been used to explore developmental speech perception questions. This dissertation encourages the use of domestic dogs as a behavioral model for speech perception processes. Specifically, dog models are suggested for questions about…

Implemented in 1998, the original intention of the California Newborn Hearing Screening Program (NHSP) was to provide Deaf babies early language opportunities so they can be successful academically. However, 20 years after the inception of the NHSP, Deaf children continue to be the lowest-performing group of students in public schools. One reason…

Younger biological siblings of children with autism spectrum disorder (sibs-ASD) are at a heightened risk for developing communication disorders, such as autism spectrum disorder or language impairment. Two strategies that are theoretically motivated as potentially beneficial for sibs-ASD are follow-in comments and providing input in episodes of…

In diglossic contexts, when speakers typically use two different languages on a regular basis, bilingual speakers display a wide array of attitudes towards each of their languages and associated cultures (Galindo, 1995) and such variability in attitudes can affect their linguistic behaviors (Lambert, Hodgson, Gardner & Fillenbaum, 1960).…

Researchers have found young children's academic skills and life outcomes are correlated to teachers' postsecondary education. Despite this, 60% of infant/toddler-PK4 teachers who work in center-based settings in the District of Columbia do not have postsecondary education beyond the high school level. The purpose of this basic qualitative study…