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acoustic-phonetic characteristics of lengthening in stuttering and non-stuttering speech

INTRODUCTIONOne of the most characteristic symptoms of stuttering is the fitful lengthening of the initial speech sounds of the words. The occurrence and the phonetic properties of lengthening seem to be speaker-dependent. However, the lengthening is a phenomenon that can be found frequently in non-stuttering speech as well. In Hungarian spontaneous speech lengthening can be spotted mostly with vowels; frequently on definite articles (a and az). The perception of lengthening depends on variou140

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acoustic-phonetic characteristics of lengthening in stuttering and non-stuttering speech

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    1. ACOUSTIC-PHONETIC CHARACTERISTICS OF LENGTHENING IN STUTTERING AND NON-STUTTERING SPEECH Bóna, Judit PhD assistant lecturer Eötvös Loránd University, Department of Phonetics H-1088 Budapest, Múzeum krt. 4/A, Hungary bona_judit@freemail.hu

    4. THE LENGHTENINGS OF THE SERIOUS STUTTERERS

    5. OCCURRENCES Normal subjects Frequency: 1 to 1.2 lengthenings per 100 words Stutterers Frequency: 4.5 to 42 lengthenings per 100 words

    6. CONCLUSIONS The absolute duration of lengthening is longer with serious stutterers than with those of mild stutterers and non-stutterers. Lengthening is (i) frequently longer than 1 sec and (ii) accompanied by turbulent noise with serious stutterers. The consonants are more frequently lengthened than the vowels by the stutterers. The control speakers show the tendency to lengthen the vowels. There is no difference in the durations of lengthenings between mild stutterers and the control speakers. There are differences, however, in the phenomenon of lengthenings between mild stutterers and non-stutterers concerning their frequency, the type of the lengthened sounds, and the word categories where they occur. The form of occurrence of lengthening seems to be definitive in early identification of stuttering.

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