Youngsters with Specific Language Impairment: Progress Toward a Grammatical Phenotype

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Kids with Specific Language Impairment: Progress Toward a Grammatical Phenotype Presentation by Mabel L. Rice Georgia State University March 18, 2002

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Background: What are the Mechanisms That Underlie Children's Acquisition of Morphosyntax? Presumption of uniform strength : All "typical" kids procure dialect easily, taking after a similar planning components and a similar general arrangement. An accentuation on invariant properties of dialect acquisition.  "by and large, dialect procurement is a tenaciously powerful process; from what we can advise there is practically no real way to keep it from happening shy of bringing a youngster up in a barrel." Pinker, 1984, p. 29.

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Updated supposition: Otherwise "ordinary" kids can have dialect debilitations (SLI); there is surprising and unexplained change crosswise over kids. Some moderately invariant properties of morphosyntax show unforeseen individual changeability

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Two Kinds of Variation Across Children 2.1 Background: Conventional idea of variety "standardizing" variety referenced to age desires ringer molded bend

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Number of Children Performance Level

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Two Kinds of Variation Across Children 2.1 Background: Conventional thought of variety "regularizing" variety referenced to age desires chime formed bend meaning of "SLI" meaning of "dialect cluttered"

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Number of Children Performance Level

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2.2 Variation in onset timing : Late activation of dialect obtaining mechanisms?

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A poor start for an in place dialect framework versus a poor start for an underspecified sentence structure

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The estimation of the 3-assemble plan: Affected, age-coordinated, dialect coordinated

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The estimation of the 3-aggregate outline: Affected, age-coordinated, dialect coordinated Affected < Age matches = "Dialect Impairment"

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The estimation of the 3-bunch outline: Affected, age-coordinated, dialect coordinated Affected < Age matches = "Dialect Impairment" Affected < dialect coordinated = "Dialect hindrance past general dialect delay"

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2.3    Variation in securing timing mechanisms for TNS, ages 3-8 years SLI youngsters begin later, and demonstrate slower procurement timing albeit comparable development bends

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2.3    Variation in obtaining timing mechanisms for TNS, ages 3-8 years SLI kids begin later, and indicate slower procurement timing in spite of the fact that similar development bends Performance Data

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2.3    Variation in procurement timing mechanisms for TNS, ages 3-8 years SLI kids begin later, and demonstrate slower securing timing in spite of the fact that similar development bends Performance Data Comprehension Data

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Young kids indicate variety that vanishes by age 5 years, at grown-up linguistic use Performance Data

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Young kids indicate variety that vanishes by age 5 years, at grown-up language structure Comprehension Data

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SLI kids demonstrate variety in a range far beneath age desires

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3. In the meantime of variety in TNS- marking, other morphology is nonvariant

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4. Lexical records Show Consistent Variation Across the Growth Curve, and Do Not Differentiate SLI from Language-Equivalent Group # Different Words

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4. Lexical files Show Consistent Variation Across the Growth Curve, and Do Not Differentiate SLI from Language-Equivalent Group # Different Words # Verb Types

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4. Lexical records Show Consistent Variation Across the Growth Curve, and Do Not Differentiate SLI from Language-Equivalent Group # Different Words # Verb Types # Verb Tokens

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4. Lexical records Show Consistent Variation Across the Growth Curve, and Do Not Differentiate SLI from Language-Equivalent Group # Different Words # Verb Types # Verb Tokens % General All Purpose Verbs

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4. Lexical records Show Consistent Variation Across the Growth Curve, and Do Not Differentiate SLI from Language-Equivalent Group # Different Words # Verb Types # Verb Tokens % General All Purpose Verbs PPVT Raw Scores

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5. Identification of Variability in TNS Acquisition Requires Indices that Capture the Probabilistic Character of Optionality

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5. Identification of Variability in TNS Acquisition Requires Indices that Capture the Probabilistic Character of Optionality Emergence measures, for example, Index of Production Syntax (IPSYN) are not delicate to language structure markers

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5. Discovery of Variability in TNS Acquisition Requires Indices that Capture the Probabilistic Character of Optionality Emergence measures, for example, Index of Production Syntax (IPSYN) are not touchy to language structure markers Composite records, for example, Developmental Sentence Scoring are not delicate to punctuation markers

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6. Timing of Acquisition Differs for Morphosyntactic and Morphonological Components of TNS-Marking

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6. Timing of Acquisition Differs for Morphosyntactic and Morphonological Components of TNS-Marking "strolled" as limited in morphosyntax "runned" as limited "kept running" as limited + morphophonologically exact

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7. Development Curve Components and Predictors of Growth are Similar for TNS/Finiteness Indices, however Differ from Morphophonological Index TNS Productions Linear and quadratic segments for SLI and MLU bunches; same bends for both gatherings Non-Predictors: Intelligence, vocabulary (PPVT-R), Mother's training Predictor: MLU

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Irregular Past Tense Linear development just, for both gatherings Non-indicators: Mother's instruction Predictors: MLU, vocabulary, knowledge Finite past tense Linear and quadratic parts for SLI and MLU bunches; same bends for both groups Non-indicators: Intelligence, vocabulary, and mother's instruction Predictor: MLU

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Conclusions: TNS/AGR-stamping (limit) takes after development bends that are direct + quadratic fit as a fiddle and development is not anticipated by insight, vocabulary, or mother's instruction, and is decidedly anticipated by MLU, in spite of the fact that not unequivocally. At the point when morphophonological exactness is incorporated into the estimation, the development bend gets to be straight just and the indicators move to incorporate a kid's vocabulary and non-verbal knowledge.

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8. Cross-clinical Comparisons as a Way of Unraveling the Relationship of TNS, MLU, Cognitive and Lexical Acquisition: A Comparison of SLI and WMS Children Matched for MLU, Disparate for Cognitive and Lexical Acquisition .

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8. Cross-clinical Comparisons as a Way of Unraveling the Relationship of TNS, MLU, Cognitive and Lexical Acquisition: A Comparison of SLI and WMS Children Matched for MLU, Disparate for Cognitive and Lexical Acquisition . MLU proportionate crosswise over SLI and WMS

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8. Cross-clinical Comparisons as a Way of Unraveling the Relationship of TNS, MLU, Cognitive and Lexical Acquisition: A Comparison of SLI and WMS Children Matched for MLU, Disparate for Cognitive and Lexical Acquisition . MLU proportionate crosswise over SLI and WMS CA diverse amongst SLI and WMS

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8. Cross-clinical Comparisons as a Way of Unraveling the Relationship of TNS, MLU, Cognitive and Lexical Acquisition: A Comparison of SLI and WMS Children Matched for MLU, Disparate for Cognitive and Lexical Acquisition . MLU proportional crosswise over SLI and WMS CA distinctive amongst SLI and WMS IQ < SLI

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8. Cross-clinical Comparisons as a Way of Unraveling the Relationship of TNS, MLU, Cognitive and Lexical Acquisition: A Comparison of SLI and WMS Children Matched for MLU, Disparate for Cognitive and Lexical Acquisition . MLU equal crosswise over SLI and WMS CA distinctive amongst SLI and WMS IQ < SLI WMS < SLI on number of words understood

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8. Cross-clinical Comparisons as a Way of Unraveling the Relationship of TNS, MLU, Cognitive and Lexical Acquisition: A Comparison of SLI and WMS Children Matched for MLU, Disparate for Cognitive and Lexical Acquisition . MLU identical crosswise over SLI and WMS CA diverse amongst SLI and WMS IQ < SLI WMS < SLI on number of words understood SLI < WMS on three measures of TNS: regular past –ed 3 rd individual solitary –s BE copula and helper

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SLI = WMS on non-TNS morphemes Plural –s In/On

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9. A Final Methodological Note: MLU is a Stable Developmental Measure

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10. Interpretative Comments Outcomes are perfect with phonetic models of the grown-up punctuation that place a moderately discrete morphosyntax and TNS-stamping as required elements of proviso development Evidence is good with a 2-stage maturational model, one that controls introductory appearance of dialect (i.e., "start-up") and another that controls certain syntactic properties versus general lexical development and general condition development

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Overall, bolster for an Extended Optional Infinitive period that coincides with a for the most part hindered semantic framework in kids with SLI Selective abating of certain linguistic properties is clear in the mandatory properties of clausal structure Measurement exactness is important. To catch optionality, require measures that catch the probabilisitic way of optionality

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Implications for Genetic Studies What components of dialect securing are defenseless against phenotypic variety — onset? general deferral? delay-inside postponement? Is a syntactic marker age-subordinate, or likewise ev

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