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Child Neuropsychology
A Journal on Normal and Abnormal Development in Childhood and Adolescence
Volume 19, 2013 - Issue 3
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Original Articles

Intuitive geometry and visuospatial working memory in children showing symptoms of nonverbal learning disabilities

, , &
Pages 235-249 | Received 26 Dec 2010, Accepted 29 Oct 2011, Published online: 01 Mar 2012
 

Abstract

Visuospatial working memory (VSWM) and intuitive geometry were examined in two groups aged 11–13, one with children displaying symptoms of nonverbal learning disability (NLD; n = 16), and the other, a control group without learning disabilities (n = 16). The two groups were matched for general verbal abilities, age, gender, and socioeconomic level. The children were presented with simple storage and complex-span tasks involving VSWM and with the intuitive geometry task devised by CitationDehaene, Izard, Pica, and Spelke (2006). Results revealed that the two groups differed in the intuitive geometry task. Differences were particularly evident in Euclidean geometry and in geometrical transformations. Moreover, the performance of NLD children was worse than controls to a larger extent in complex-span than in simple storage tasks, and VSWM differences were able to account for group differences in geometry. Finally, a discriminant function analysis confirmed the crucial role of complex-span tasks involving VSWM in distinguishing between the two groups. Results are discussed with reference to the relationship between VSWM and mathematics difficulties in nonverbal learning disabilities.

Notes

1The interactions between VSWM tests and groups were never significant, demonstrating that the slopes of the covariates are homogeneous in the two groups. Specifically, for the total score of geometry: dot matrix task by group, F(1, 28) < 1; VPTA by group, F(1, 28) < 1; jigsaw puzzle task by group, F(1, 28) = 1.88 p = .18.

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