It is clear that her output is more constrained by her own phonological 'realization' rules than by her inability to articulate the sounds and sound sequences of English.This shows that, even in an abnormal case of language acquisition, children's phonological competence and their phonetic performance need to be differentiated carefully.
This is less likely to happen in instructional than in naturalistic settings because the critical amount of exposure is usually not available in the former.Research on the CPH suggests that adult learners' developed cognitive skills help them learn a foreign language.
This longitudinal data of MLU and Types of lexicons () shows the increase of MLU is increasing the types of lexicons. However, it would be very infant to generalize one is depending on another. Increasing of types of lexicons and MLU in both typically developing child and the child with developmental language disorder is different. It would also be important to note that, by looking to this longitudinal data, it is very difficult to take a point which can be considered a critical mass.
5. Both traditions stress that meaning and language are socially constructed (although critical researchers are quick to point out that while interpretations may be constructed, forces of oppression are real in their consequences and hence may be understood as such).
The present paper used the Joseph, Serratrice, & Conti-Ramsden (2002) from Child Language Data Exchange System/CHILDES (MacWhinney, 2000) as a child with language disorder, and transcript file created by Lieven, Salomo & Tomasello (2009) as typically developing child. Both files have been used as a longitudinal case study on language acquisition of children. Since, the data is longitudinal and the objective of the paper is to see types and MLU, much emphasis is given to match both child with DLD and typically developing child with MLU. Therefore, the present analysis is done by taking 17 conversations on different time. Both files are non-elicited, spontaneous speech, and non-specified. In both cases, the corpora were selected by length of data collection.
Reports of dichotic listening, experiments in which different stimuli are presented simultaneously to the two ears, also show that language functions are lateralized much earlier than the critical period.
It was recorded that her syntax created sentences such as 'the woman is bus the going' and 'banana the eat.'All these cases of children reared in isolated environments reveal the difficulties of learning a language after the critical period.
By the age of eight and one half Isabelle was not easily distinguishable from ordinary children of her age.It is reasonable to consider that she was able to acquire her language because she started learning before the critical period came to an end.The second case was Genie, who was found at the age of about fourteen (Curtiss, Fromkin, Krashen, Rigler, and Rigler 1974).
However, a recent survey disputes his claim because children with Down's syndrome have a build-in endpoint to their ability (Gleitman 1984).Secondly, the theory of brain's lateralization at the age of two, with the critical period set by Lenneberg (1967), is also criticized.
Studies of Feral ChildrenSupports most frequently quoted for the CPH are the case studies of the children who had been isolated from language and who tried to acquire the language before and after their critical period.
Although both hemispheres of the brain are equal at birth, the function of language gradually settles in the dominant left hemisphere of the brain after biological maturation or the critical period.
Consequently, the critical period for language learning is considered to be the biologically determined period in which the brain keeps its plasticity for acquisition of any language.At first it was expected that the function of human language acquisition was clarified by exploring a special structure, which all other animal brains lack.
All of these criticisms of the past studies show how difficult it is to connect brain functions and language acquisition.Moreover, the different methods for the research on the CPH have also resulted in varieties of inconsistencies.
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