PURPOSE This study examined the effect of alphabet supplementation (AS) on temporal and spectral features of speech production in individuals with cerebral palsy and dysarthria. METHOD Twelve speakers with dysarthria contributed speech samples using habitual speech and while using AS. One hundred twenty listeners orthographically transcribed speech samples. Differences between habitual and AS...

OBJECTIVES The effects of levodopa on articulatory dysfunction in patients with Parkinson's disease remain inconclusive. This study aimed to investigate the effects of levodopa on isolated vowel articulation and motor performance in patients with moderate to severe Parkinson's disease, excluding speech fluctuations caused by dyskinesia. METHODS 21 patients (14 males and 7 females) and 21 age-...

PURPOSE This study examined vowel characteristics in adult-directed (AD) and infant-directed (ID) speech to children with hearing impairment who received cochlear implants or hearing aids compared with speech to children with normal hearing. METHOD Mothers' AD and ID speech to children with cochlear implants (Study 1, n=20) or hearing aids (Study 2, n=11) was compared with mothers' speech to ...

introduction: on the importance of the formant frequency, it is enough to say that the first three formants of a vowel and their internal relationships are the major components in detection of vowel type by listener. moreover, the quality of a vowel depends on its factorial frequencies. the main application of measuring factorial frequency is for description of vowel errors because recognizing ...

This article describes the results of two experiments. Experiment 1 was a cross-sectional study designed to explore developmental and cross-linguistic variation in the vowel space of 10- to 18-month-old infants, exposed to either Canadian English or Canadian French. Acoustic parameters of the infant vowel space were described (specifically the mean and standard deviation of the first and second...

in this paper, the validity of the key prediction of adaptive dispersion theory was tested. according to this prediction, vowels of a given language are organized in such a way that they are sufficiently distinct on the perceptual level. it implies that more crowded inventories, which also have wider f1 dimension, occupy greater vowel spaces than inventories with fewer vowels.  to investigate t...

This paper investigates style differences in the distribution of Dutch diphthongal vowels over the acoustic vowel space. It aims to find out whether a paradox that arises in monophthongs, i.e. that variation between vowels decreases in informal speech and variation within vowels increases without a loss of identifiability, is also found for diphthongal vowels. Our data reveal only a partial par...

OBJECTIVE This study examined longitudinal change in speech intelligibility, vowel space, and word duration over 18 months among children with cerebral palsy (CP) who varied in the severity of their speech motor involvement. The study also examined relationships among variables at each time point. METHOD Twenty-two children with CP participated in the study (mean age = 50 months at the first ...

Cross-language research on adult speech perception demonstrates a strong effect of linguistic experience on consonant perception but not on vowel perception. Our paper re-examines the effect of linguistic experience on adults’ vowel perception. First, identification and goodness functions for the high front quadrant of the vowel space were mapped for speakers of Swedish, English, and Spanish. S...