Speech recognition is an active process that involves some form of predictive coding. This statement is relatively uncontroversial. What is less clear is the source of the prediction. The dual-stream model of speech processing suggests that there are two possible sources of predictive coding in speech perception: the motor speech system and the…

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…

We report two sets of experiments showing that the large individual variability in language learning success in adults can be attributed to neurophysiological, neuroanatomical, cognitive, and perceptual factors. In the first set of experiments, native English-speaking adults learned to incorporate lexically meaningfully pitch patterns in words. We…

Speech perception and speech production were examined in 3-year-old Dutch children at familial risk of developing dyslexia. Their performance in speech sound categorisation and their production of words was compared to that of age-matched children with specific language impairment (SLI) and typically developing controls. We found that speech…

The current dissertation investigated clear speech production of Korean stops to examine the proposal that the phonetic targets of phonological categories are more closely approximated in hyperarticulated speech. The investigation also considered a sound change currently underway in Korean stops: younger speakers of the Seoul dialect produce the…

At the level of clinical speech/language evaluation, the repetition type of conduction aphasia is characterized by repetition difficulties concomitant with reduced short-term memory capacities, in the presence of fluent spontaneous speech as well as unimpaired naming and reading abilities. It is still unsettled which dysfunctions of the…

We present a computational model that learns a coupling between motor parameters and their sensory consequences in vocal production during a babbling phase. Based on the coupling, preferred motor parameters and prototypically perceived sounds develop concurrently. Exposure to an ambient language modifies perception to coincide with the sounds from…

Notes that phonemic restoration is a powerful auditory illusion. Points out that when part of an utterance is replaced by another sound, listeners perceptually restore the missing speech. Several paradigms measure this illusion and explore its bottom-up and top-down bases. Findings reveal that acoustic properties of the replacement sound strongly…

Results from 3 experiments in auditory word recognition involving a total of 266 undergraduates supported interactive models of lexical processing, but required additional sublexical processes. The hypothesized sublexical mechanism is fast acting and frequency sensitive and produces top-down effects, but its operation has not yet been fully…

The world's languages display important differences in their rhythmic organization; most particularly, different languages seem to privilege different phonological units (mora, syllable, or stress foot) as their basic rhythmic unit. There is now considerable evidence that such differences have important consequences for crucial aspects of language…

The paper discusses some important distinctions between linguistic competence and linguistic performance. It is the authors' contention that the distinction between the two must be maintained in experimental linguistics, or else inadequate models result. Three experiments are described. In the first, subjects pronounce nonsense words and the…

Reviews phoneme monitoring studies from 1969 to 1996 and groups them in terms of issues addressed with the task, including the contribution of the lexicon to speech perception, processing complexity, attention, contribution of prosodic information, and the basic unit of speech perception. Identifies and highlights task demands and artifactual…

Four experiments involving 42 Harvard University students and 35 subjects addressing the role of attention in phonetic perception demonstrate that attention influences the signal-to-noise ratio in the phonetic encoding of acoustic cues. Implications for understanding speech perception and general theories of the role of attention in perception are…

Two experiments, a shadowing task and a mispronunciation-detection task, were performed to investigate the interactions between the data-driven primary speech perception process and the knowledge-driven word recognition process in the comprehension of continuous speech. Results are applied to an active direct access model of word recognition.…