Speech exhibits quasi-rhythmic regularities at multiple timescales, which seem to be crucial to comprehension. Both children's ability to extract rhythm from complex stimuli and to produce rhythmic patterns are known to undergo changes from infancy to adulthood. However, it remains unclear what rhythm skills specifically related to speech look…

Understanding how a child's language system develops into an adult-like system is a central question in language development research. An increasingly influential account proposes that the brain constantly generates top-down predictions and matches them against incoming input, with higher-level cognitive models serving to minimize prediction…

This dissertation investigated how four factors -- the degree of L2 experience, L1 sound structure, age difference in L1 language development and age of L2 exposure -- affect the perceptual cue weighting of duration and spectral differences for English tense-lax vowel contrasts. Four major hypotheses were tested: desensitization hypothesis (DH)…

Reading is an essential skill for daily life and academic success. According to the connectionist model of reading, word recognition involves orthographic, phonological, and semantic processing, as well as the interactions among them. Language skill such as phonological processing, develops earlier than reading acquisition, and thus likely serves…

A large body of research suggests that spoken language processing is heavily influenced by social characteristics of the speaker, and conversely, that socio-cognitive processing is influenced by the language spoken by our interlocutors. However, little is known about the extent to which this interaction that is observed in adulthood has its roots…

The present dissertation analyzed speech production and perception in early heritage Spanish-English bilingual children. Specifically, I investigated how perception and production of lexical stress develops in bilingual children. Current models of second language (L2) speech perception do not include heritage bilinguals or suprasegmental aspects…

Traditionally, Basque has three voiceless affricates that are different in their place of articulation. More precisely, affricates can have a lamino-alveolar, apico-alveolar, and prepalatal place of articulation and the graphemes used to represent them are respectively. Likewise, Basque has been described as having three fricatives with the same…

Speech production and perception are inextricably linked systems. Speakers modify their speech in response to listener characteristics, such as age, hearing ability, and language background. Listener-oriented modifications in speech production, commonly referred to as clear speech, have also been found to affect speech perception by enhancing…

Successful spoken language comprehension depends upon both sensory and cognitive processing. Since older adults often experience declines in one or both of these domains, and perform worse on some language processing tasks than younger listeners, an important question is how declines to both auditory perception and cognitive abilities affect…

The current dissertation investigated segmental and prosodic aspects of first- (L1) and second-language (L2) speech production. Forty Korean-speaking adults and children varying in L2 experience (6 months-inexperienced vs. 6 years-experienced) as well as twenty age-matched native English speaking adults and children participated. Experienced…

Along with the global spread of English and the wide recognition of World Englishes, a whole breadth of studies have been conducted to explore the attitudes of learners toward different varieties of English. In China, however, only two pioneering studies have examined this issue. To address this gap, this study investigated the attitudes of…