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In evolutionary anthropology and evolutionary linguistics, the mimetic theory of speech origins [1] is an analysis of the factors leading to the evolution of language in human ancestors, typically during the Homo erectus era. This theory is most commonly associated with Merlin Donald, who developed the idea in his 1991 book Origins of the ...
The gestural theory states that speech was a relatively late development, evolving by degrees from a system that was originally gestural. Human ancestors were unable to control their vocalisation at the time when gestures were used to communicate; however, as they slowly began to control their vocalisations, spoken language began to evolve.
Cover of the first edition. Biology Today is a college-level biology textbook that went through three editions in 1972, 1975, and 1980. The first edition, published by Communications Research Machines, Inc. (CRM) and written by a small editorial team and large set of prominent "contributing consultants", is notable for its lavish illustrations and its humanistic approach.
The second phase began in the late 1970s . In 1976 Chomsky formulated the fundamental questions of biolinguistics as follows: i) function, ii) structure, iii) physical basis, iv) development in the individual, v) evolutionary development. In the late 1980s a great deal of progress was made in answering questions about the development 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.
The refutation of the second criticism of functionalism, that it is static and has no concept of change, has already been articulated above, concluding that while Parsons' theory allows for change, it is an orderly process of change [Parsons, 1961:38], a moving equilibrium. Therefore, referring to Parsons' theory of society as static is inaccurate.
Parsons had asked Schütz to give a presentation at the rationality seminar, which he did on April 13, 1940, and Parsons and Schütz had lunch together afterward. Schütz was fascinated with Parsons' theory, which he regarded as the state-of-the-art social theory, and wrote an evaluation of Parsons' theory that he kindly asked Parsons to comment.
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/