Language is a unique skill used by humans to communicate thoughts and feelings. For most individuals, language is understood through different sensory modalities--for instance, hearing auditory words relies on audition, while perceiving visual speech via lipreading and reading written text both utilize the visual system. Although these different…

The visual system is tuned by its inputs. The behavior of reading offers a unique way to examine tuning for visual representations (letters) because readers have massive experience recognizing letters in a systematic context (reading). One aspect of reading is that letters are highly crowded within words, which severely limits their…

Learning to read is an important milestone in children's development. Factors in the home environment is been linked to the behavioral and neural correlates of reading, but further work is needed to unpack the underlying mechanisms. The home literacy environment (HLE) plays a role in children's reading and language development, while parental…

Prelingually and profoundly deaf individuals learn to read without complete access to the sounds of language. Nevertheless, many become proficient readers, and the neurocognitive underpinnings of deaf readers' processes differ from those of hearing readers, particularly in orthographic processing. In English, morphological structure is relatively…

Previous research has shown a relationship between robust neural encoding of speech by the auditory brainstem and children's phonological abilities. Two areas of brainstem encoding this work has included are the ABR dimensions of consistency, or how similar responses are to a repeated stimulus, and differentiation, or the degree to which responses…

The long-term objective of this project was to better understand how shorter auditory experience and spectral degradation of the cochlear implant (CI) signal impact spoken language processing in deaf children with CIs. The specific objective of this research was to utilize psycholinguistic methods to investigate the mechanisms underlying observed…

An over-arching goal in neurolinguistic research is to characterize the neural bases of semantic representation. A particularly relevant goal concerns whether we represent features and events (a) together in a generalized semantic hub or (b) separately in distinct but complementary systems. While the left anterior temporal lobe (ATL) is strongly…

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…

Adult literacy training is known to be difficult in terms of teaching and maintenance (Abadzi, 2003), perhaps because adults who recently learned to read in their first language have not acquired reading automaticity. This study examines fast word recognition process in neoliterate adults, to evaluate whether they show evidence of perceptual…

Although spoken word recognition is more fundamental to human communication than text recognition, knowledge of word-processing in auditory cortex is comparatively impoverished. This dissertation synthesizes current models of auditory cortex, models of cortical pattern recognition, models of single-word reading, results in phonetics and results in…

When we hear a word, it is remarkable how we store, activate and rapidly retrieve a vast amount of relevant information within a few hundred milliseconds. This thesis examines how meaning is processed in parallel--but with critical differences--between the two hemispheres of the brain. Event-related brain potentials (ERP) were used to examine…