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CLEX: A cross-linguistic lexical norms database*


Parent report has proven a valid and cost-effective means of evaluating early child language. Norming datasets for these instruments, which provide the basis for standardized comparisons of individual children to a population, can also be used to derive norms for the acquisition of individual words in production and comprehension and also early gestures and symbolic actions. These lexical norms have a wide range of uses in basic research, assessment and intervention. In addition, cross-linguistic comparisons of lexical development are greatly facilitated by the availability of norms from diverse languages. This report describes the development of CLEX, a new web-based cross-linguistic database for lexical data from adaptations of the MacArthur-Bates Communicative Development Inventories. CLEX provides tools for a range of analyses within and across languages. It is designed to incorporate additional language datasets easily, and to permit users to define mappings between lexical items in pairs of languages for more specific cross-linguistic comparisons.

Corresponding author
[*]Address for correspondence: Rune Nørgaard Jørgensen, Center for Child Language, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark. e-mail:
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Bates, E., Marchman, V., Thal, D., Fenson, L., Dale, P., Reznick, J. S., Reilly, J. & Hartung, J. (1994). Developmental and stylistic variation in the composition of early vocabulary. Journal of Child Language 21, 85–123.
Bleses, D., Vach, W., Slott, M., Wehberg, S., Thomsen, P., Madsen, T. & Basbøll, H. (2008 a). Early vocabulary development in Danish and other languages: A CDI-based comparison. Journal of Child Language 35, 619–50.
Bleses, D., Vach, W., Slott, M., Wehberg, S., Thomsen, P., Madsen, T. & Basbøll, H. (2008 b). The Danish Communicative Development Inventories: validity and main developmental trends. Journal of Child Language 35, 651–69.
Dale, P. S. (1996). Parent report assessment of language and communication. In Cole, K. N., Dale, P. S. & Thal, D. J. (eds), Assessment of communication and language, 161–82. Baltimore: Paul H. Brookes Publishing Co.
Dale, P. S. & Fenson, L. (1996). Lexical development norms for young children. Behavior Research Methods, Instruments, & Computers 28, 125–27.
Fenson, L., Dale, P. S., Reznick, J. S., Bates, E., Thal, D. J. & Pethick, S. J. (1994). Variability in early communicative development. Monographs of the Society for Research in Child Development 59(5) (Serial No. 242).
Fenson, L., Marchman, V., Thal, D. J., Dale, P. S., Reznick, J. S. & Bates, E. (2007). MacArthur-Bates Communicative Development Inventories. Users guide and technical manual (2nd edn). Baltimore: Paul H. Brookes Publishing Co.
Goodman, J. C., Dale, P. S. & Li, P. (2008). Does frequency count? Parental input and the acquisition of vocabulary. Journal of Child Language 35, 515–31.
MacWhinney, B. (2000). The CHILDES Project: Tools for analyzing talk. Mahwah, NJ: Lawrence Erlbaum Associates.
NICHD Early Child Care Research Network (2000). The relation of child care to cognitive and language development. Child Development 71, 960–80.
Plomin, R. & Dale, P. S. (2000). Genetics and early language development: A UK study of twins. In Bishop, D. V. M. & Leonard, L. B. (eds), Speech and language impairments in children: Causes, characteristics, intervention, and outcome, 3551. Philadelphia: Taylor & Francis.
Tardif, T., Fletcher, P., Liang, W. & Kaciroti, N. (in press). Early vocabulary development in Mandarin (Putonghua) and Cantonese. Journal of Child Language.
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Journal of Child Language
  • ISSN: 0305-0009
  • EISSN: 1469-7602
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