Motor system plasticity after unilateral injury in the developing brain.
Preston T J A Williams, Yu-Qiu Jiang, John H Martin
PMID 28972274WHAT IT FOUND
Early skilled movement training after unilateral brain injury may shape motor circuits in animal models.
The review does not show it improves function in children.
Key findings
01In an animal model of unilateral injury, reducing corticospinal activity during early development left only about 50% of spinal cholinergic interneurons, and constraint-induced movement therapy with skilled training immediately after injury restored interneuron numbers and behaviour; delaying therapy by 1 month did not.
02In mature animal work, activating muscle sensory fibres reduced corticospinal connections by about 50% and reduced the response produced by motor cortex stimulation by about 50%; partial deafferentation increased corticospinal connections and doubled the muscle-evoked response.
03The paper proposes, but does not test in humans, that therapy during the first 6 to 12 months may be more effective than at 5 to 10 years, because corticospinal responses become predominantly contralateral after about 6 months.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The main timing and circuit findings come from animal models, not from a clinical trial in children. The paper does not report outcomes from a therapy delivered to patients. The human early-intervention point is presented as a hypothesis, not as tested evidence. The review does not specify which patients, dose, frequency, or exact treatment components should be used in practice.
Declared interests
The authors declared no interests perceived as a conflict or bias.
The easy way to misread this
Do not read this as proof that early skilled training or motor cortex stimulation improves function in children. The timing effect is from an animal model, and the human early-intervention idea is stated as a hypothesis.