Social cognition skills among females with fragile X.
Among adult women, fragile X carrier status alone does not create extra social-cognitive problems once IQ is accounted for.
01Research in Context
What this study did
Dougherty et al. (1994) asked if women who carry the fragile X gene have extra trouble reading faces or taking someone else’s point of view.
They tested two groups of women: carriers and non-carriers. Both groups had similar IQ scores.
Each woman completed emotion-perception and theory-of-mind tasks while the team kept IQ constant in the stats.
What they found
Once IQ was held steady, carrier status made no difference.
Women with the fragile X gene scored the same as peers without it on both social-cognitive tasks.
How this fits with other research
Dickson et al. (2005) seems to disagree. They found theory-of-mind problems in boys with fragile X syndrome. The gap closes when you notice the 1994 study tested adult women, while K et al. tested children. Age, not syndrome, likely drives the different results.
Hatton et al. (1999) backs the null finding. Boys with fragile X also looked like IQ-matched peers once overall ability was controlled, mirroring the adult women data.
Howard et al. (2023) extends the picture downward. They show school-aged girls with fragile X lag in math, attention, and working memory even when verbal IQ is matched, hinting that academic and executive targets may matter more than social-cognition goals for younger learners.
Why it matters
For adult women, skip the fragile X label when writing social-skills goals. Focus on the woman’s current IQ and social repertoire instead. Save your energy for academic or executive interventions in younger students, where clearer deficits appear.
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02At a glance
03Original abstract
Emotion perception and perspective-taking skills were examined among women with or without the fragile X gene. The performance of 56 control women was compared to the performance of 46 women who were carriers of the fragile X gene. Twenty-seven of the carrier women had 0-1% cytogenetic expression and did not appear affected by the gene, whereas the remaining 19 women had > or = 2% cytogenetic expression and did appear affected by the gene. The emotion perception task employed was one for which deficits have been reported among individuals with autism. The results show that performance on this emotion-perception test and the perspective-taking measure was significantly related to full-scale IQ scores, but not to fragile X group status when effects of IQ were removed. Thus the results do not support the hypothesis that perspective-taking or emotion perception deficits are a component of the fragile X phenotype in females and represent an important differentiation between fragile X and autism.
Journal of autism and developmental disorders, 1994 · doi:10.1007/BF02172129