A specific deficit in visuospatial simultaneous working memory in Down syndrome
Article first published online: 13 MAR 2009
© 2009 The Authors. Journal Compilation © 2009 Blackwell Publishing Ltd
Journal of Intellectual Disability Research
Volume 53, Issue 5, pages 474–483, May 2009
How to Cite
Lanfranchi, S., Carretti, B., Spanò, G. and Cornoldi, C. (2009), A specific deficit in visuospatial simultaneous working memory in Down syndrome. Journal of Intellectual Disability Research, 53: 474–483. doi: 10.1111/j.1365-2788.2009.01165.x
- Issue published online: 14 APR 2009
- Article first published online: 13 MAR 2009
- Accepted 16 February 2009
- Down syndrome;
- intellectual disability;
- processing speed;
- visuospatial working memory
Background Recent studies have demonstrated that individuals with Down syndrome (DS) present both central and verbal working memory deficits compared with controls matched for mental age, whereas evidence on visuospatial working memory (VSWM) has remained ambiguous. The present paper uses a battery of VSWM tasks to test the hypothesis that individuals with DS can also encounter specific difficulties in VSWM.
Method Four tasks were administered to 34 children and adolescents with DS and 34 controls matched for verbal mental age. In two of these tasks, participants had to remember a series of locations sequentially presented on a matrix (spatial-sequential WM); in another two, they had to remember locations simultaneously presented (spatial-simultaneous WM).
Results and Conclusions Results showed that individuals with DS are poorer than controls in the spatial-simultaneous tasks, but not in the spatial-sequential tasks. These findings were not due to a difference in speed of visuospatial processing. In fact, when performances of the two groups in VSWM were compared using speed measures as covariates, differences between groups remained. It is suggested that the simultaneous VSWM deficit of individuals with DS could be due to the request for processing more than one item at a time.