Neuropsychological profile in adults with neurofibromatosis type 1 compared to a control group.
Adults with NF1 have weaker visual-spatial memory, auditory working memory, and mental flexibility than IQ-matched peers.
01Research in Context
What this study did
M-Tassé et al. (2013) tested the adults who have neurofibromatosis type 1 (NF1). They matched each adult with a control of the same age, sex, and full-scale IQ.
Everyone took a short battery: draw a design from memory, repeat backwards strings of numbers, and sort cards by changing rules. The team then compared the NF1 and control scores.
What they found
NF1 adults scored lower on all three tasks even though both groups had the same IQ. The gaps were medium to large, showing the problems are not just general low intelligence.
Visual-spatial memory, auditory working memory, and cognitive flexibility were each weaker in the NF1 group.
How this fits with other research
Davidson et al. (2014) extend these findings to children. They showed that kids with NF1 also have a timing deficit: slower reactions to predictable cues that link to poor visual-motor skills. Together the two papers map a life-span pattern of syndrome-specific cognitive weaknesses.
Howard et al. (2023) used the same IQ-matched design in girls with fragile X. Like NF1, the girls showed selective hits to working memory and math, proving the method can spot syndrome fingerprints.
Gau et al. (2013) seem to clash at first: they blame childhood inattention for teen visuo-spatial memory gaps, not a syndrome. The difference is control. M-J held IQ constant and still found NF1 deficits, while Shur-Fen removed current ADHD symptoms and IQ. Both agree visuo-spatial memory can be singled out, but NF1 does it without needing an ADHD history.
Why it matters
If you serve adults with NF1, do not assume their IQ tells the whole story. Add quick visual-spatial and auditory working-memory probes to your assessment. When you see gaps, teach compensatory strategies such as verbal rehearsal, color coding, or step cards instead of re-teaching basic facts. Targeting these specific weak spots can boost daily independence more than global cognitive drills.
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02At a glance
03Original abstract
BACKGROUND: Neurofibromatosis type 1 (NF1) is a common inherited autosomal dominant condition, characterised by multiple café-au-lait macules, axillary and/or inguinal freckling, iris Lisch nodules and tumours of the nervous system such as neurofibromas and optic pathway gliomas. At the same time, NF1 is frequently associated with intellectual disabilities across several neuropsychological domains. Existing neuropsychological data in NF1 adults are limited and sometimes contradictory. Moreover, most studies use a non-IQ-controlled norm group for comparison. This study sought to investigate specific neuropsychological characteristics in intellectual abilities unrelated to the global intellectual capacity. METHOD: Twenty NF1 adults and an IQ-, age- and gender-matched control group completed a comprehensive neuropsychological test battery composed of specific cognitive tests investigating visual-spatial abilities and memory, auditory memory, selective and sustained attention and executive functioning. A short version of the Wechsler Adult Intelligence Scale - III was also administered to both groups. RESULTS: Norm comparison showed that both groups perform poorly on most neuropsychological functions, except for sustained attention. However, comparison with the IQ-matched control group showed significantly lower scores on visual-spatial abilities and memory, on auditory working memory and on tests for cognitive flexibility in NF1 adults. Nevertheless, as the significant difference in average estimated IQ score between the NF1 group and the selected control group almost reaches the 5% significance level, further analysis is needed to include IQ as a covariate. Eventually, problems in visual-spatial skills and auditory long-term memory seem to be specific NF1-related deficits, while problems in attention and executive functioning are particularly related to their general lowered intellectual abilities. CONCLUSION: Taking into account that primary visual perception problems could be part of a more general central coherence deficit while interpreting auditory memory problems as possibly related to deficits in language use and comprehension, this idea also fits with the observation of several problems in social information processing and functioning of NF1 persons.
Journal of intellectual disability research : JIDR, 2013 · doi:10.1111/j.1365-2788.2012.01648.x