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Mean Length of Utterance in Czech Toddlers: Validity Estimates and Comparison of Words, Morphemes, and Syllables
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SYSNO ASEP 0584693 Document Type J - Journal Article R&D Document Type The record was not marked in the RIV Subsidiary J Článek ve SCOPUS Title Mean Length of Utterance in Czech Toddlers: Validity Estimates and Comparison of Words, Morphemes, and Syllables Author(s) Matiasovitsová, K. (CZ)
Čechová, P. (CZ)
Sláma, J. (CZ)
Homolková, K. (CZ)
Smolík, Filip (PSU-E) RID, ORCID, SAISource Title Journal of Speech Language and Hearing Research. - : American Speech-Language-Hearing Association - ISSN 1092-4388
Roč. 67, č. 3 (2024), s. 837-852Language eng - English Country US - United States Keywords child ; child language ; child preschool ; Czech Republic ; humans ; language ; language tests ; linguistics ; vocabulary Subject RIV AN - Psychology OECD category Psychology (including human - machine relations) Method of publishing Limited access Institutional support PSU-E - RVO:68081740 EID SCOPUS 85187777134 DOI 10.1044/2023_JSLHR-23-00251 Annotation PURPOSE: We examined the properties of mean length of utterance (MLU) in Czech, a morphologically complex Slavic language. We compared the scores of MLU calculated in different units and based on different sample lengths and assessed its validity against another transcript and test-based measures. METHOD: One hundred nine children were recorded during free-play at 2,6 and 3,11 (years,months). We compared MLU in syllables, morphemes, and words (MLUw) in transcripts of different lengths (50, 75, 100, and all available utterances). For evaluating the validity of MLU, we also calculated Index of Productive Syntax (IPSyn) and number of different words (NDW) and used results of receptive vocabulary and grammar comprehension tests. RESULTS: The different MLU measures based on different sample lengths correlated closely with MLU in transcripts of all utterances (all rs > .87). We found mostly strong correlations between MLU, IPSyn, and NDW at both time points and weak or moderate correlations between MLU and grammar and vocabulary. Regression models showed the significant unique effect of MLUw at 2,6 for MLUw (β = .29) and grammar (β = .33) at 3,11 and vocabulary (β = .27) at 3,7. CONCLUSION: MLUw based on all utterances was confirmed as a valid measure of early language skills in Czech, as it is stable in time and shows concurrent and predictive relations with other transcript-based and test-based measures. Workplace Institute of Psychology Contact Štěpánka Halamová, Halamova@praha.psu.cas.cz, Tel.: 222 222 096 Year of Publishing 2025
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