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Typically the position of the sound within a word is considered and targeted. The sound appears in the beginning of the word, middle, or end of the word (initial, medial, or final). Take for example, correction of an "S" sound (lisp). Most likely, a speech language pathologist (SLP) would employ exercises to work on "Sssssss."
Final-obstruent devoicing or terminal devoicing is a systematic phonological process occurring in languages such as Catalan, German, Dutch, Quebec French, Breton, Russian, Polish, Lithuanian, Turkish, and Wolof. In such languages, voiced obstruents in final position (at the end of a word) become voiceless before voiceless consonants and in pausa.
Most commonly, the change is a result of sound assimilation with an adjacent sound of opposite voicing, but it can also occur word-finally or in contact with a specific vowel. For example, the English suffix -s is pronounced [s] when it follows a voiceless phoneme (cats), and [z] when it follows a voiced phoneme (dogs). [1]
The Extensions to the International Phonetic Alphabet for Disordered Speech, commonly abbreviated extIPA / ɛ k ˈ s t aɪ p ə /, [1] are a set of letters and diacritics devised by the International Clinical Phonetics and Linguistics Association to augment the International Phonetic Alphabet for the phonetic transcription of disordered speech.
Children with a lisp, however, have trouble distinguishing /θ/ and /ð/ from /s/ and /z/ respectively in speech, using a single /θ/ or /ð/ pronunciation for both, and may never master the correct sounds without speech therapy. The lisp is a common speech impediment in English. Foreign learners may have parallel problems.
Speech-language pathologists (SLPs) may provide individual therapy for the child to assist with speech production problems such as stuttering. They may consult with the child's teacher about ways in which the child might be accommodated in the classroom, or modifications that might be made in instruction or environment.
A different example of coronal harmony, sometimes referred to as NATI rule, occurs in Sanskrit, where [n] is retroflexed to [ɳ] if it is preceded by a retroflex continuant, mainly [ɽ] and [ʂ], in the same word, even at a distance. The retroflexion spreads from left to right affecting any coronal nasal until the word boundary is reached.
The voiced alveolar sibilant is common across European languages, but is relatively uncommon cross-linguistically compared to the voiceless variant. Only about 28% of the world's languages contain a voiced dental or alveolar sibilant. Moreover, 85% of the languages with some form of [z] are languages of Europe, Africa, or Western Asia.