Item and error analysis on Raven's Coloured Progressive Matrices in Williams Syndrome

Van Herwegen, Jo, Farran, Emily and Annaz, Dagmara (2011) Item and error analysis on Raven's Coloured Progressive Matrices in Williams Syndrome. Research in Developmental Disabilities, 32(1), pp. 93-99. ISSN (print) 0891-4222

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Raven’s Coloured Progressive Matrices (RCPM) is a standardised test that is commonly used to obtain a non-verbal reasoning score for children. As the RCPM involves the matching of a target to a pattern it is also considered to be a visuo-spatial perception task. RCPM is therefore frequently used in studies in Williams Syndrome (WS), a rare genetic disorder, in order to match WS participants to a control group or as a single measure to predict performance on a test-condition in developmental trajectory analyses. However, little is known about the performance of participants with WS on the RCPM. The current study compared the type of errors and the difficulty of each item for 53 participants with WS to 53 typically developing children who were individually matched by the total raw score for RCPM. Results showed that the participants with WS made the same proportion of error types and that the proportion of error types changed similarly to those of typically developing controls over development. Furthermore, the differential item difficulty between the two groups was highly similar. It is therefore argued that, although participants with WS are delayed on RCPM, their performance is not atypical which suggests that RCPM performance is supported by typical mechanisms. The RCPM is therefore a useful tool to match WS to control groups or to construct developmental trajectories.

Item Type: Article
Uncontrolled Keywords: Williams syndrome, Raven's coloured progressive matrices, types of errors, item analysis, developmental trajectories, phenotype, performance, disorders, attention, genotype, children, faces
Research Area: Psychology
Faculty, School or Research Centre: Faculty of Arts and Social Sciences > School of Social Science (until November 2012)
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Depositing User: Jo Van Herwegen
Date Deposited: 18 Nov 2010 11:17
Last Modified: 18 Jan 2011 08:30

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