Characterizing Developmental and Behavioral Profiles in Developmental Synaptopathies to Inform Clinical Trial Endpoints.
Latha Valluripalli Soorya, Camille W Brune, Cristan A Farmer and 27 others
PMID 40858308WHAT IT FOUND
Standard IQ and autism tests often fail in children with severe intellectual disability because scores hit the bottom of the scale.
Adaptive behavior measures like the Vineland worked for everyone, making them more reliable for tracking progress in clinical trials.
Key findings
01Cognitive testing showed clear floor effects where scores clustered at the bottom of the scale, obscuring true variability in children with severe intellectual disability.
02The Vineland adaptive behavior scale was feasible for all participants across the three genetic syndromes because it has no IQ or mental age restrictions.
03Gold-standard autism assessments (ADOS-2 and ADI-R) were inappropriate for half of the Phelan-McDermid syndrome sample due to developmental and physical requirements.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study is cross-sectional, analyzing only baseline data, so it cannot assess how well these measures detect change over time (responsiveness). The cohorts were predominantly White and non-Hispanic, limiting generalizability to other racial and ethnic groups. Participants were English-speaking, excluding non-English families. The study did not analyze the impact of medical comorbidities (e.g., seizures) on the developmental trajectories. Missing data were treated equally, regardless of whether they were due to ineligibility or logistical errors.
Declared interests
The study was funded by the Rare Disease Clinical Research Network (RDCRN) and supported by the National Institute of Health (N.I.H.).
The easy way to misread this
Do not assume that standard IQ scores accurately reflect the cognitive abilities of children with severe intellectual disability in these syndromes. The study found that these tests hit a floor, meaning they cannot distinguish between levels of impairment or capture small gains. Use adaptive behavior measures instead.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →