Clustering and Switching on verbal fluency tests in elementary school children with and without learning difficulties.
Diego Siqueira de Lima Teixeira, Maria Teresa Carthery-Goulart, Katerina Lukasova
PMID 37820096WHAT IT FOUND
Children with learning difficulties produced fewer semantic clusters than typically developing peers, but showed no difference in switching or phonemic fluency.
For clinicians, this suggests word retrieval issues in these students are primarily semantic, not executive.
Key findings
01Students with learning difficulties had significantly lower total cluster counts in the semantic fluency test compared to typically developing students.
02There were no significant differences between groups in the number of switches or mean cluster size for either semantic or phonemic fluency tests.
03The total number of clusters was the strongest predictor of performance in both semantic and phonemic verbal fluency tests.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The groups were unequal in size (24 LD vs 44 TD), which reduces statistical power for detecting differences in the smaller group. The 'learning difficulties' group was defined solely by teacher referral, without standardized diagnostic criteria for specific learning disabilities, which may have introduced heterogeneity. The study did not control for socioeconomic factors or reading exposure, which could influence semantic knowledge. The cross-sectional design prevents conclusions about developmental trajectories.
Declared interests
The authors declared no conflicts of interest. The study was approved by the Research Ethics Committee of the ABC Federal University.
The easy way to misread this
Do not conclude that children with learning difficulties have intact executive functions. The lack of difference in 'switching' scores may reflect the insensitivity of the measure or the small sample size, rather than a true absence of executive deficits.