Mean Length of Utterance (MLU)
- Dr. Cheryl Smith Gabig
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Mean length of utterance (MLU) is the average number of morphemes per utterance. It is an index of expressive language development used beyond the stage of single words, when a child uses two or more words together in an utterance. It is calculated in 100 spontaneous utterances by counting the number of morphemes in each utterance divided by the total number of utterances. MLU is used as a benchmark to assess individual differences and developmental changes in grammatical development in children in the early stages of language acquisition. Children with autism frequently demonstrate differences in MLU compared to non-autistic developmentally delayed children and typically developing children by producing shorter utterances with fewer grammatical morphemes. Recent research has acknowledged the use and utility of using MLU as an index for language development in children with autism (Condouris, Meyer, & Tager-Flusberg, 2003; Tager-Flusber ...
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- Condouris, K., Meyer, E., & Tager-Flusberg, H. (2003). The relationship between standardized measures of language and measures of spontaneous speech in children with autism. American Journal of Speech-Language Pathology, 12, 349–358. CrossRef
- Eigsti, I.-M., Bennetto, L., & Dadlani, M. B. (2007). Beyond pragmatics: Morphosyntactic development in autism. Journal of Autism and Developmental Disorders, 37, 1007–1023. CrossRef
- Tager-Flusberg, H., Paul, R., & Lord, C. (2005). Language and communication in autism. In D. J. Cohen & F. R. Volkmar (Eds.), Handbook of autism and pervasive developmental disorders (3rd ed., pp. 335–364). New York: Wiley.
- Tager-Flusberg, H., Rogers, S., Cooper, J., Landa, R., Lord, C., Paul, R., Rice, M., Stoel-Gammon, C., Wetherby, A., & Yoder, P. (2009). Defining spoken language benchmarks and selecting measures expressive language development for young children with autism spectrum disorders. Journal of Speech-Language-Hearing Research, 52, 643–652. CrossRef
- Mean Length of Utterance (MLU)
- Reference Work Title
- Encyclopedia of Autism Spectrum Disorders
- pp 1813-1814
- Print ISBN
- Online ISBN
- Springer New York
- Copyright Holder
- Springer Science+Business Media New York
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- Fred R. Volkmar (1)
- Editor Affiliations
- 1. Irving B. Harris Professor of Child Psychiatry, Pediatrics and Psychology Yale University School of Medicine, Chief, Child Psychiatry Children's Hospital at Yale-New Haven Child Study Center
- Dr. Cheryl Smith Gabig (11101)
- Author Affiliations
- 11101. Department of Speech-Language-Hearing Sciences, Lehman College/The City University of New York, 250 Bedford Park Blvd. West, 10468, Bronx, NY, USA
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