Cognitive control of movement in Down syndrome.
Kids with Down syndrome need stronger cues to stop, even when their raw stop speed looks normal.
01Research in Context
What this study did
Brunamonti et al. (2011) tested how kids with Down syndrome stop themselves mid-action. They used a stop-signal task. Kids press a button fast, then try to stop when a beep sounds.
The team matched the Down syndrome group to peers with the same mental age. This lets them see if problems go beyond general delay.
What they found
The Down syndrome group had weaker inhibitory control. Their stop-signal reaction time looked okay, but the overall brake curve was flatter. That means they need louder or longer cues to stop.
In plain words, they can hit the brakes, but the brakes feel mushy.
How this fits with other research
Lee et al. (2022) watched babies with Down syndrome at 12 months. Poor attention shifting then predicted worse executive function six months later. Together the papers draw a line: early attention gaps grow into school-age stopping problems.
Yaniv et al. (2017) and Channon et al. (2004) saw the same mushy-brake pattern in adults with Tourette syndrome. Three different groups, same task, same result. This boosts confidence that the task spots true inhibition holes, not just Down syndrome quirks.
Raspail et al. (2025) link weak inhibition to social errors in teens with mild ID. The brake problem may ripple into social life, not just lab games.
Why it matters
When you see a client with Down syndrome who blurts answers or grabs items, do not blame "global delay." Test both stop-signal speed and the full brake curve. If the curve is flat, add extra warning cues, visual stop cards, or longer response windows. Start early: train attention shifting in toddlers and keep sharpening brakes across grades.
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02At a glance
03Original abstract
Inhibition of inappropriate responses allows to shape the motor behavior accordingly to the context in which a subject acts and is an essential executive function. Inhibition has been poorly investigated in Down Syndrome (DS) patients. We tested, using a countermanding task, the inhibitory control in a group of DS patients and in a group of patients with developmental disorders of non-genetic etiology, matched for mental age. We found that the duration of the stopping process, the stop signal reaction time (SSRT), was not statistically different in the two groups of patients. At the same time, the normalized inhibitory function resulted shallower in DS patients indicating a poor inhibitory control. We interpreted the results on the basis of the known anatomical differences in the brain of adult DS patients and more specifically in a possible altered dialogue between the fronto-striatal and fronto-cerebellar networks during motor control.
Research in developmental disabilities, 2011 · doi:10.1016/j.ridd.2011.03.008