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Journal of Speech, Language, and Hearing Research Vol.47 1286-1300 December 2004. doi:10.1044/1092-4388(2004/097)
© American Speech-Language-Hearing Association
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Fast Mapping of Words and Story Recall by Individuals With Down Syndrome

Elizabeth Kay-Raining Bird 1
Robin S. Chapman 2

Scott E. Schwartz 3
1 Dalhousie University, Halifax, Canada
2 University of Wisconsin-Madison
3 University of Colorado-Boulder

rainbird{at}dal.ca

This study compared adolescents with Down syndrome to nonverbal mental-age matched controls in their ability to fast map new noun vocabulary in spoken story contexts. Context for novel words varied within subjects in the distance between mentions (close-distant) and the ease of inferring a real word for the referent (specificity). The 23 participants with Down syndrome (DS) were aged 12.8–20.3 years. The 24 typically developing (TD) children, matched on visual nonverbal mental age (MA), were 4.1 to 6.1 years old. Participants listened to 4 tape-recorded stories, each containing 3 mentions of 2 novel words in close or distant proximity and with clear or uncertain reference, and recalled each story after presentation. Fast-mapping production was measured by the occurrence of the novel word in story recall. Fast-mapping comprehension was measured by asking children to define the novel words. The DS group did not differ from the TD group in novel word production but seemed to have more difficulty with novel word definition. For both groups, novel word production was higher in the nonspecific than the specific referent condition, suggesting that availability of a real word label interfered with fast mapping. Recall of story propositions was poorer for the DS group. For both groups, story recall was better for text units not directly associated with novel words than for text units containing novel words, suggesting a trade-off effect in processing. Regression analyses indicated that syntax comprehension, rather than mean length of utterance, predicted novel word production in both groups; MA additionally contributed to predict DS story recall.

KEY WORDS: fast mapping, memory, narratives, Down syndrome, language disorders

Submitted on September 17, 2002
Revised on July 28, 2003
Accepted on March 5, 2004




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