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Speech delay, also known as alalia, refers to a delay in the development or use of the mechanisms that produce speech. [1] Speech – as distinct from language – is the actual process of making sounds, using such organs and structures as the lungs, vocal cords, mouth, tongue, teeth, etc. Language delay refers to a delay in the development or use of the knowledge of language.
Some language development experts have characterized child directed speech in stages. Primarily, the parents use repetition and also variation to maintain the infant's attention. Secondly, the parent simplifies speech to help in language learning. Third, any speech modifications maintain the responsiveness of the child.
Speakers vary their speed of speaking according to contextual and physical factors. A typical speaking rate for English is 4 syllables per second, [5] but in different emotional or social contexts the rate may vary, one study reporting a range between 3.3 and 5.9 syl/sec, [6] Another study found significant differences in speaking rate between story-telling and taking part in an interview.
These components have been studied in relation to speech development in Goo Goo Ga Ga, and have been found to relate to future speech outcomes. [13] If babbling occurs during the first year of life, it can typically be concluded that the child is developing speech normally. As babies grow and change, their vocalizations will change as well.
Specific language impairment (SLI) is diagnosed when a child's language does not develop normally and the difficulties cannot be accounted for by generally slow development, physical abnormality of the speech apparatus, autism spectrum disorder, apraxia, acquired brain damage or hearing loss. Twin studies have shown that it is under genetic ...
The term developmental language disorder (DLD) was endorsed in a consensus study involving a panel of experts (CATALISE Consortium) in 2017. [3] The study was conducted in response to concerns that a wide range of terminology was used in this area, with the consequence that there was poor communication, lack of public recognition, and in some cases children were denied access to services.
Shriberg (1993) [13] proposed a model for speech sound acquisition known as the Early, Middle, and Late 8 based on 64 children with speech delays ages 3 to 6 years. Shriberg proposed that there were three stages of phoneme development. Using a profile of "consonant mastery" he developed the following: Early 8 – /m, b, j, n, w, d, p, h/
In general, the voice modulations needed to express strong emotions are particularly difficult for patients with Parkinson's disease. Abnormal pauses in speech are also a characteristic of Parkinsonian dysprosody, including both pauses in general speech and intra-word pauses. A decrease in speech rate can also be observed in Parkinson's ...