Quantitative sensory testing of temperature, pain, and touch in adults with Down syndrome.
Adults with Down syndrome show typical sensory thresholds, yet lower IQ predicts poorer sharp-dull discrimination—factor cognition into sensory test results.
01Research in Context
What this study did
de Knegt et al. (2015) ran a full German QST battery on adults with Down syndrome. They tested warmth, cool, heat pain, touch, vibration, and sharp-dull discrimination. Each adult also took an IQ test so the team could see if mental ability linked to sensory scores.
The study used the same lab protocol doctors use for nerve damage, but this time the goal was to map baseline sensory skills in DS. No treatment was given; it was pure assessment.
What they found
Group-level scores looked typical. Adults with DS felt heat, cold, and touch about the same as expected norms.
The only stand-out: within the DS group, people with lower IQ scores made more errors on the sharp-dull test. In short, general mental ability colored fine sensory discrimination.
How this fits with other research
Fründt et al. (2017) ran the same QST kit on autistic adults and also saw normal thresholds, a clean conceptual replication across diagnoses.
Aller et al. (2023) widened the lens to children with DS, ASD, and other delays. They found more atypical caregiver-reported sensory traits than Nanda saw with lab tools, showing parent reports can flag issues the lab misses.
Cascio et al. (2008) saw heightened thermal-pain and vibration sensitivity in autistic adults, yet Nanda found no heat-pain shift in DS. The two studies seem to clash, but they test different diagnoses and sensory channels, so both can be true.
Why it matters
If you assess an adult with Down syndrome, do not assume dull sensory nerves. Standard QST norms mostly hold, but check IQ before you interpret sharp-dull errors. A low score may reflect cognitive load, not nerve damage. Share this with medical teams so they avoid mis-diagnosing peripheral neuropathy and you can focus your behavior plans on real, not assumed, sensory needs.
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02At a glance
03Original abstract
The spinothalamic pathway mediates sensations of temperature, pain, and touch. These functions seem impaired in children with Down syndrome (DS), but have not been extensively examined in adults. The objective of the present study was to compare the spinothalamic-mediated sensory functions between adults with DS and adults from the general population and to examine in the DS group the relationship between the sensory functions and level of intellectual functioning. Quantitative sensory testing (QST) was performed in 188 adults with DS (mean age 37.5 years) and 142 age-matched control participants (median age 40.5 years). Temperature, pain, and touch were evaluated with tests for cold-warm discrimination, sharp-dull discrimination (pinprick), and tactile threshold, respectively. Level of intellectual functioning was estimated with the Social Functioning Scale for Intellectual Disability (intellectual disability level) and the Wechsler Preschool and Primary Scale of Intelligence--Revised (intelligence level). Overall, the difference in spinothalamic-mediated sensory functions between the DS and control groups was not statistically significant. However, DS participants with a lower intelligence level had a statistically significant lower performance on the sharp-dull discrimination test than DS participants with higher intelligence level (adjusted p=.006) and control participants (adjusted p=.017). It was concluded that intellectual functioning level is an important factor to take into account for the assessment of spinothalamic-mediated sensory functioning in adults with DS: a lower level could coincide with impaired sensory functioning, but could also hamper QST assessment.
Research in developmental disabilities, 2015 · doi:10.1016/j.ridd.2015.08.016