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A longitudinal study of lexical development in young children with ASD |
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Jenea Peralejo - University of British Columbia
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Judith Johnston - University of British Columbia
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| SRCLD Year: |
2008 |
| Presentation Type: |
Poster Presentation |
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| Presentation Time: |
(na) |
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| - Developmental Disabilities |
| - Language Acquisition |
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Children with Autism Spectrum Disorders (ASD) have deficits in communication and delays in language development, but there have been few studies of their vocabulary. This study compared longitudinal parent report data from the MCDI collected for 49 children with ASD over three years with data from the MCDI norms. We focused on three aspects of lexical development: (1) change in lexical composition as evident in percentage of predicates/nominals; (2) order of emergence for predicate types; and, (3) predictive value of lexical variables for later grammatical development. Groups were matched on total MCDI scores for each comparison. Subsequent analysis indicated (1) virtually identical percentages of predicates/nominals for the two groups at 3 time points, as well as (2) highly similar orders of emergence for different predicate types and for the early words in each meaning category. We also found (3) that lexical variables, especially number of predicates, strongly predicted grammatical complexity one year later. We conclude that lexical development in ASD follows the normal course, albeit later and more slowly. |
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