In English, the feature [tense] or [ATR] (advanced tongue root) has been used to encompass the vowels that are produced on the extreme edges of the acoustic and articulatory spaces. The lax counterparts to these vowels are generally produced closer to the center of those spaces. The present study is based on the hypothesis that the extreme positioning in both articulatory and acoustic space evo...

introduction: the feedback provided by auditory apparatus equips normal hearing people with an important controlling mechanism over the speech production processes. the speech of hearing-impaired children is both perceptually and acoustically abnormal. this study tried to compare the formant frequencies of three long vowels in persian-speaking children who used cochlear implant and those who we...

A deductive approach is developed to predict vocalic systems. First, vowels are proposed from an efficient and simple use of an acoustic tube. Then, a maximum acoustic dispersion criterion is applied to classify the obtained vowels.

Past research has indicated that English-learning infants begin segmenting words from speech by 7-5 months of age (Jusczyk & Aslin, 1995). More recent work has demonstrated, however, that 7-5-month-olds' segmentation abilities are severely limited. For example, the ability to segment vowel-initial words from speech reportedly does not appear until 13.5 to 16 months of age (Mattys & Jusczyk, 200...

This paper reports the results of an experimental study on non-native production of English vowels. Two groups of Persian EFL learners varying in language proficiency were tested on their ability to produce the nine plain vowels of American English. Vowel production accuracy was assessed by means of acoustic measurements. Ladefoged and Maddison’s (1996) F1 F2 measurements for American English v...