Error analysis of Raven's Coloured Progressive Matrices in children and adolescents with cerebral palsy.
Kids with CP show unique error patterns on Raven’s matrices—use these qualitative differences, not just total scores, when interpreting non-verbal intelligence assessments.
01Research in Context
What this study did
The team gave Raven’s Coloured Progressive Matrices to the kids with cerebral palsy and 42 typically-developing kids matched on age and sex.
They scored every wrong answer by type and by where on the page the error happened.
What they found
Both groups ended with almost the same total score, so CP looked “average” at first glance.
Kids with CP made more “incomplete pattern” errors and missed items on the right side of the page. These quirks were tied to CP severity and receptive vocabulary, not just age.
How this fits with other research
Denis et al. (2011) saw the opposite in Williams Syndrome: error shapes looked like younger typical kids, just delayed. CP kids break the pattern, so delay alone can’t explain the data.
Facon et al. (2010) showed RCPM items behave the same for Down syndrome and controls once scores are matched. Hopkins et al. (2023) prove the tool is still fair, but you must read the errors, not just the total.
Philip et al. (2020) link CP brain scans to visual-field cuts. The right-side misses on RCPM may be a cheap early flag for cerebral visual impairment before MRI.
Why it matters
If you test non-verbal IQ in kids with CP, ignore the headline number. Circle each wrong box and note the type: incomplete, wrong rule, or side bias. A right-side cluster plus incomplete errors hints at visual neglect or CVI and tells you to screen receptive language before writing goals. Share the error map with the teacher and OT so everyone targets the real deficit, not a phantom “low IQ.”
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Join Free →Print a blank RCPM record form, mark error type and page spot for each miss, then compare to the CP pattern described.
02At a glance
03Original abstract
BACKGROUND: Analysis of the errors in the Raven's Coloured Progressive Matrices (RCPM) has been previously performed for children with intellectual disabilities but has not been investigated for those with cerebral palsy (CP). This study aimed to investigate whether the types and positions of errors made by individuals with CP differed from those made by typically developing (TD) controls. METHODS: Forty-five participants with CP aged 4-18 years and 30 TD children aged 3-9 years underwent RCPM testing. We first compared the RCPM performance and error characteristics between the groups and then examined the association between RCPM and the severity of CP and receptive vocabulary in the CP group. RESULTS: The results showed that while mean total scores in the two groups were comparable, the types and positions of errors made by individuals with CP differed from those of TD controls. The development of non-verbal intelligence in children with CP increased with age; when controlling for age, non-verbal intelligence was significantly correlated with all three functional levels of CP severity and receptive vocabulary. CONCLUSIONS: This study provides valuable insights into the problem-solving strategies employed by children with CP.
Journal of intellectual disability research : JIDR, 2023 · doi:10.1111/jir.13034