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Speeded naming, frequency and the development of the lexicon in Williams syndrome

Thomas, Michael S.C. and Dockrell, J.E. and Messer, D. and Parmigiani, C. and Ansari, D. and Karmiloff-Smith, Annette (2006) Speeded naming, frequency and the development of the lexicon in Williams syndrome. Language and Cognitive Processes 21 (6), pp. 721-759. ISSN 0169-0965.

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Official URL: http://dx.doi.org/10.1080/01690960500258528

Abstract

Atypical vocabulary has been reported as one of the most notable features of the language of adolescents and adults with Williams syndrome (WS), including use of unusual or low frequency words. Two hypotheses were identified regarding the developmental origins of this phenomenon. The intra-lexicon hypothesis views the cause in terms of domain specific anomalies of structure or activation dynamics in the WS lexicon. The extra-lexicon hypothesis views the cause in terms of pragmatic influences, whereby individuals with WS use social engagement devices in their language in service of their ‘‘hyper-social’’ profile (Jones et al., 2000), and domaingeneral deficits to lexical-semantic representations in line with the level of learning disability present in WS. The hypotheses were evaluated using a speeded picture-naming task, in which frequency and semantic category were manipulated as implicit variables. The performance of 16 adolescents and adults with WS was compared with two individually matched control groups, one matched on chronological age (CA) and the other on receptive vocabulary age (RVA). Developmental trajectories were also constructed to assess the relationship between performance and age. Results indicated slower and less accurate naming in the WS group compared with both CA and RVA groups, but frequency and semantic category effects in line with the RVA group. Trajectories were delayed but not atypical. The data support a normal encoding of word frequency (rarity) in the WS lexicon, with rareword usage explained as a pragmatic aspect of the WS social profile. The finding sets bounds on the domain-specificity of the complex developmental pathway between atypical genotype and atypical phenotype in WS.

Item Type: Article
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Psychological Sciences
Depositing User: Sarah Hall
Date Deposited: 17 Apr 2012 14:05
Last Modified: 17 Apr 2013 12:22
URI: http://eprints.bbk.ac.uk/id/eprint/4658

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