How does brain activation differ in children with unilateral cerebral palsy compared to typically developing children, during active and passive movements, and tactile stimulation? An fMRI study.
Kids with unilateral CP recruit both sides of the brain for one-handed tasks, so keep motor drills brief and light.
01Research in Context
What this study did
Van de Winckel et al. (2013) scanned the kids with unilateral cerebral palsy and 14 typical kids. Each child lay in an fMRI while the team touched their hand or asked them to squeeze a bulb.
The scan tracked which brain parts lit up during passive touch, active squeeze, and rest. All kids were 8-12 years old and could follow simple directions.
What they found
Typical kids used only the opposite-side sensorimotor strip and a small bit of cerebellum. Kids with CP lit up those areas plus the same-side strip and a much larger cerebellum patch.
The extra activation grew when the task got harder. More brain lights meant the CP group was working overtime to do the same move.
How this fits with other research
Osorio et al. (2025) saw the opposite pattern in ASD: weaker auditory-cortex firing but stronger long-range links. Both studies show neurodevelopmental brains reroute work, yet the direction differs—CP adds local juice, ASD drops it.
Bao et al. (2017) also found weak thalamic ‘filtering’ in ASD during touch and sound. Ann’s CP kids had normal thalamic gates but extra cortex lights, hinting that sensory overload comes from different weak links in each diagnosis.
Erickson et al. (2016) tracked local connectivity across age in ASD and saw childhood gaps close by adolescence. Ann’s single-age snapshot in CP suggests the extra same-side wiring may stay, calling for early, not wait-and-see, motor plans.
Why it matters
When you ask a child with hemiplegic CP to grasp a peg, their brain is already running two engines. Keep reps short, give longer rest, and watch for fatigue signs like drift or slower speed. Use light weights or spring-loaded toys so the overloaded same-side cortex does not have to work even harder. If the child looks overwhelmed, switch to tactile prompting first—their thalamus can still filter, but the cortex needs a break.
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02At a glance
03Original abstract
The aim of the functional magnetic resonance imaging (fMRI) study was to investigate brain activation associated with active and passive movements, and tactile stimulation in 17 children with right-sided unilateral cerebral palsy (CP), compared to 19 typically developing children (TD). The active movements consisted of repetitive opening and closing of the hand. For passive movements, an MRI-compatible robot moved the finger up and down. Tactile stimulation was provided by manually stroking the dorsal surface of the hand with a sponge cotton cloth. In both groups, contralateral primary sensorimotor cortex activation (SM1) was seen for all tasks, as well as additional contralateral primary somatosensory cortex (S1) activation for passive movements. Ipsilateral cerebellar activity was observed in TD children during all tasks, but only during active movements in CP children. Of interest was additional ipsilateral SM1 recruitment in CP during active movements as well as ipsilateral S1 activation during passive movements and tactile stimulation. Another interesting new finding was the contralateral cerebellum activation in both groups during different tasks, also in cerebellar areas not primarily linked to the sensorimotor network. Active movements elicited significantly more brain activation in CP compared to TD children. In both groups, active movements displayed significantly more brain activation compared to passive movements and tactile stimulation.
Research in developmental disabilities, 2013 · doi:10.1016/j.ridd.2012.07.030