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Clinical application of mean babbling level and syllable structure level

Correspondence concerning this article should be sent to: Sherrill R. Morris, School of Allied Health and Communicative Disorders, Northern Illinois University, DeKalb, Illinois 60115, telephone: (815) 753-5472, fax: (815) 753-9128, e-mail: srmorris{at}niu.edu.

Purpose: This article reviews two independent phonological assessment measures, Mean Babbling Level (MBL) and Syllable Structure Level (SSL). Both measures summarize phonetic inventory and syllable shape in a calculated average and have been used in research to describe the phonological abilities of children aged 9 to 36 months. An example of the measures' clinical use is presented.

Method: Six studies reporting MBL and SSL were reviewed. Combined, the studies included 207 participants. One hundred twenty-eight of those were developing language as expected and 79 were identified as having speech-language impairment.

Conclusions: Overall, the studies indicate SSL is a reliable measure that increases as children develop. Children with language impairment exhibit lower SSL scores than children with typical language skills. Further, lower than expected MBL is predictive of lack of meaningful speech at 24 months of age.

Discussion: MBL and SSL have clinical application in terms of initial evaluation as well as progress monitoring. Recommendations for standardized corpus inclusion procedures are presented.

KEY WORDS: babbling, syllable structure, phonological development, assessment, language impairment

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