![]() Introduction Phonetic perception is the perception of the linguistically relevant attributes of physical speech signals. A model of spoken language is described in which the prosodic properties of the speech signal are embedded in the temporal dynamics associated with the syllable, a unit serving as the organizational interface among the various tiers of linguistic representation. The ability to understand spoken language (i.e., intelligibility) vitally depends on the integrity of the modulation spectrum within the core range of the syllable (3-10 Hz) and reflects the variation in syllable emphasis associated with the concept of prosodic prominence ("accent"). The syllable reflects a singular property of the acoustic signal - the modulation spectrum - which provides a principled, quantitative framework to describe the process by which the listener proceeds from sound to meaning. This paper presents an alternative view, one in which the time scales required to accurately describe and model spoken language are both shorter and longer than the phonetic segment, and are inherently wedded to the syllable. The paradigm and the results it yields, paired with a neurolinguistic framework for AV-integration and reading, provide the basis for further AV-research in dyslexia.Ĭlassical models of speech recognition assume that a detailed, short-term analysis of the acoustic signal is essential for accurately decoding the speech signal and that this decoding process is rooted in the phonetic segment. Hence, the phonological deficit which results in poor pseudoword reading, is clearly present. The results further revealed that the phonological abilities required to read pseudowords seem to be generally impaired across the dyslexic subjects of the sample tested here. Overall, the results of the experiments provide strong evidence that in dyslexics, audiovisual speech perception and visual speech perception are poorly developed skills compared to unimpaired controls. The experiments I conducted as well as the theoretical framework outlined in this book are based on the assumption that at the core of the linguistic symptoms of dyslexia lies a – potentially subtle – speech signal processing deficit. The obtained stimulus set was later on also used in a subsequent fMRI study and yielded further back-up for the results discussed in the final chapters of this book. Researchers over the past five decades have investigated the McGurk illu-sion and various modifications thereof, from temporal modulation to blur-ring of images, from – animated – talking heads to semi-hollow models and naturalistic videos in high definition with a millisecond-true temporal alignment.įor the empirical part of the book, a new experimental paradigm was designed permitting the tracking of subjects’ abilities to process phonological stimuli in visual- only, acoustic- only and audiovisual conditions. Audiovisual speech and visual speech perception lie at the heart of approaching the linguistic structure that seems to be most affected in dyslexics, across all languages and writing systems. This book is devoted to the search for a psycholinguistic theory that might be able to explain the origin of the pre-lexical linguistic deficit in dyslexia.
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