Dyslexic children suffer from less informative visual cues to control posture.
Dyslexic kids need richer visual cues and more time to stabilize posture—build these into motor tasks.
01Research in Context
What this study did
Razuk et al. (2014) watched 20 dyslexic kids and 20 matched peers stand still on a force plate. The room lights gave normal vision, dimmed vision, or no vision at all.
Each child stood for three 30-second trials while the plate measured tiny body sway. The team asked: do dyslexic kids use visual cues to steady posture the same way?
What they found
When lights dimmed, dyslexic children swayed almost twice as much as peers. Their bodies took longer to lock onto the remaining visual cues.
Even with full lighting, the dyslexic group still showed looser, slower postural control. Less visual information meant much wobblier standing.
How this fits with other research
van Roon et al. (2010) saw the same clumsy visuo-motor link in a different task. Their learning-disorder kids could not smoothly track a moving target on a screen. Together the studies point to one core timing weakness across hands and body.
Ortiz et al. (2014) push the problem even younger. Preschoolers at risk for dyslexia already mess up the order of flashing pictures and beeps. This suggests the postural wobble starts from early visual-timing deficits, not from years of reading failure.
All three papers show deficits only when the task needs quick, sequenced use of visual cues. Simple seeing is fine; timed action is not.
Why it matters
If you run balance games or motor drills with dyslexic clients, give them extra visual structure. Use bright floor spots, colored lines, or slow predictable light changes. Allow longer prep time before the body must react. These small tweaks turn a shaky task into a win.
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02At a glance
03Original abstract
The goal of this study was to investigate the effects of manipulation of the characteristics of visual stimulus on postural control in dyslexic children. A total of 18 dyslexic and 18 non-dyslexic children stood upright inside a moving room, as still as possible, and looked at a target at different conditions of distance between the participant and a moving room frontal wall (25-150 cm) and vision (full and central). The first trial was performed without vision (baseline). Then four trials were performed in which the room remained stationary and eight trials with the room moving, lasting 60s each. Mean sway amplitude, coherence, relative phase, and angular deviation were calculated. The results revealed that dyslexic children swayed with larger magnitude in both stationary and moving conditions. When the room remained stationary, all children showed larger body sway magnitude at 150 cm distance. Dyslexic children showed larger body sway magnitude in central compared to full vision condition. In the moving condition, body sway magnitude was similar between dyslexic and non-dyslexic children but the coupling between visual information and body sway was weaker in dyslexic children. Moreover, in the absence of peripheral visual cues, induced body sway in dyslexic children was temporally delayed regarding visual stimulus. Taken together, these results indicate that poor postural control performance in dyslexic children is related to how sensory information is acquired from the environment and used to produce postural responses. In conditions in which sensory cues are less informative, dyslexic children take longer to process sensory stimuli in order to obtain precise information, which leads to performance deterioration.
Research in developmental disabilities, 2014 · doi:10.1016/j.ridd.2014.03.045