Unpublished conference/Abstract (Scientific congresses and symposiums)
How does the visuo-spatial deficit impact basic numerical processing in Williams syndrome? The question of domain specificity.
Rousselle, Laurence; Noel, Marie-Pascale
2014Third Symposium of the Support Fund Maguerite-Marie Delacroix
 

Files


Full Text
2014-10-02-Colloque Fond MMD.pdf
Publisher postprint (529.68 kB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Abstract :
[en] It has been suggested that mathematics learning disabilities, including those of genetic origin, result from a basic impairment of quantitative representations. In Williams syndrome (WS) in particular, latest studies report a specific deficit in tasks requiring symbolic and non-symbolic numerical magnitude processing (Krajcsi et al., 2009 ; O’Hearn & Landau, 2007; Paterson et al., 2006). However, non-numerical quantitative processing has never been investigated and contradictory evidence has been reported about their ability to subitize small collections(Ansari et al., 2007; O’Hearn et al., 2005, 2011). Moreover, as patients with WS were always tested in the visual modality, it remains unclear whether their deficit is specific to the processing of numerical magnitude or result from their basic visuo-spatial impairment, which is a main characteristic of the WS cognitive phenotype. Therefore, numerical and non-numerical acuity were assessed in a group of patients with WS using quantitative comparison tasks with different visuo-spatial processing requirements. Participants were asked to compare: (1) the length of two sticks (spatial dimension) vs. the duration of two sounds (temporal dimension) to assess non numerical quantitative processing, (2) the numerosity of two visual arrays (spatial arrangement) versus two sequences of flashs (no spatial processing) to assess non-symbolic numerical processing, and (3) two Arabic numbers vs two Spoken verbal numerals to examine the access to symbolic number meaning. They also had to enumerate sets of 1 to 7 dots shown for 250 ms to explore their subitizing abilities. Results indicate that participants with WS are impaired in quantitative tasks requiring the processing of visuo-spatial dimension(s) (i.e. comparison of lengths or collections) but not in a visual task requiring processing numerosities with no spatial processing component (i.e. numerical comparison of sequences of flashs). They also present difficulties in accessing the meaning of numerical symbols whatever the format and present smaller subitizing range.
Disciplines :
Theoretical & cognitive psychology
Neurosciences & behavior
Author, co-author :
Rousselle, Laurence  ;  Université de Liège > Département de Psychologie > Psychologie du développement cognitif normal et atypique
Noel, Marie-Pascale;  Université Catholique de Louvain - UCL
Language :
English
Title :
How does the visuo-spatial deficit impact basic numerical processing in Williams syndrome? The question of domain specificity.
Publication date :
02 October 2014
Event name :
Third Symposium of the Support Fund Maguerite-Marie Delacroix
Event date :
2 octobre 2014
Available on ORBi :
since 01 February 2016

Statistics


Number of views
45 (4 by ULiège)
Number of downloads
54 (5 by ULiège)

Bibliography


Similar publications



Contact ORBi