It has been traditional in phonetic research to characterize
monophthongs using a set of static formant frequencies, i.e.,
formant frequencies taken from a single time-point in the vowel or
averaged over the time-course of the vowel. However, over the last
twenty years a growing body of research has demonstrated that, at
least for a number of dialects of North American English, vowels
which are traditionally described as monophthongs often have
substantial spectral change. Vowel inherent spectral change has
been observed in speakers productions, and has also been found to
have a substantial effect on listeners perception. In terms of
acoustics, the traditional categorical distinction between
monophthongs and diphthongs can be replaced by a gradient
description of dynamic spectral patterns. This book includes
chapters addressing various aspects of vowel inherent spectral
change (VISC), including theoretical and experimental studies of
the perceptually relevant aspects of VISC, the relationship between
articulation (vocal-tract trajectories) and VISC, historical
changes related VISC, cross-dialect, cross-language, and
cross-age-group comparisons of VISC, the effects of VISC on
second-language speech learning, and the use of VISC in forensic
voice comparison.
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