I analyze A’ingae stress assignment as determined by factors from two domains: (i) phonological, where I propose a typologically unattested glottal accent assigned at the level of the prosodic foot, and (ii) morphological, with accentual specification of suffixal lexemes. By attributing a part of the observed complexity to independently motivated glottal accent, I reduce the number of distinct lexical specifications needed to explain the six distinct accentual patterns to four suffix types. I further analyze the four different suffix types as an interaction between two binary parameters that characterize each suffix: recessive vs. dominant; and plain vs. prestressing.

The analysis is carried out in the framework of Cophonology Theory, a restrictive Optimality Theoretic approach, which allows for a parsimonious account of complex patterns emergent from interactions between phonology and morphology.

Skilled readers identify words with remarkable speed and accuracy, and fluent word identification is a prerequisite for comprehending sentences and longer texts. Although research on word reading has tended to focus on simple words, models of word recognition must nevertheless also be able to account for complex words with multiple parts or morphemes. One theory of word reading is that we break complex words into their component parts depending on whether the meaning of the whole word can be figured out from its components. For example, a ‘pay-ment’ is something (the ‘-ment’ part) that is paid ( the ‘pay-’ part); a ‘ship-ment’ is something that is shipped. However a ‘depart-ment’ is not something that departs! Thus ‘payment’ and ‘shipment’ are semantically transparent, while ‘department’ is semantically opaque. One model of word reading holds that only semantically transparent words are broken down. Other models claim that not only are all complex words —both transparent and opaque—decomposed, but so are words that are not even really complex but only appear to be, i.e. pseudo-complex words such as ‘mother’. My research examines the circumstances under which we break complex words into their component parts and in this talk I will address how this process may be instantiated in the brain.

In the last two decades there has been an upsurge of research on the bilingual mind and brain. Although the world is multilingual, only recently have cognitive and language scientists come to see that the use of two or more languages provides a unique lens to examine the neural plasticity engaged by language experience. But how? Bilinguals proficient in two languages appear to speak with ease in each language and often switch between the two languages, sometimes in the middle of a sentence. In this last period of research we have learned that the two languages are always active, creating a context in which there is mutual influence and the potential for interference. Yet proficient bilinguals rarely make errors of language, suggesting that they have developed exquisite mechanisms of cognitive control. Contrary to the view that bilingualism adds complication to the language system, the new research demonstrates that all languages that are known and used become part of the same language system. A critical insight is that bilingualism provides a tool for examining aspects of the cognitive and neural architecture that are otherwise obscured by the skill associated with native language performance in monolingual speakers. In this talk I illustrate this approach and consider the consequences that bilingualism holds more generally for cognition and learning.

Only a few years ago, it was widely accepted that cognitive abilities develop during childhood and adolescence, with cognitive decline beginning at around 20 years old for fluid intelligence and in the 40s for crystalized intelligence. The obvious outlier was language learning, which appeared to begin its decline in early childhood. All these claims have been challenged by a recent flurry of studies — both from my lab and others. In particular, the ability to collect large-scale datasets has brought into sharp relief patterns in the data that were previously indiscernible. The fluid/crystalized intelligence distinction has broken down: at almost any age between 20 and 60, some abilities are still developing, some are at their peak, and some are in decline (Hartshorne & Germine, 2015). Most surprisingly, evidence suggests that the ability to learn syntax is preserved until around 18 (Hartshorne, Tenenbaum, & Pinker, 2018). This has upended our understanding of language learning and its relationship to the rest of cognitive development. In this talk, I review recent published findings, present some more recent unpublished findings, and try to point a path forwards. I also discuss the prospects for massive online experiments not just for understanding cognitive development, but for understanding cognition in general.

I report acoustic and articulatory studies of two endangered languages with typologically unusual vowel systems. Bora, a Witotoan language spoken in Peru and Colombia, has been described as having a three-way backness contrast between unrounded high vowels /i ɨ ɯ/. An audio-video investigation of Bora vowels reveals that while none of these vowels are produced with lip rounding, the vowel described as /ɨ/ is actually a front vowel with extreme lingual-dental contact. This appears to be a previously unknown vowel type. Kalasha, a Dardic language spoken in Pakistan, has been described as having 20 vowel phonemes: plain /i e a o u/, nasalized /ĩ ẽ ã õ ũ/, retroflex /i˞ e˞ a˞ o˞ u˞/, and retroflex nasalized /ĩ˞ ẽ˞ ã˞ õ˞ ũ˞/. An ultrasound study of Kalasha vowels shows that the vowels described as retroflex are produced not with retroflexion but with various combinations of tongue bunching and other tongue shape differences, raising questions about if and how these phonetic dimensions should be integrated with notions of basic vowel quality. I discuss implications of the Bora and Kalasha data for models of vowel features.