Movement and coordination
How the brain plans, launches, and fine-tunes every movement you make - and what happens in rehab when those pathways are disrupted.
Moving a cup from the table to your mouth looks simple. Behind it, four brain regions are working simultaneously - and rehab science has mapped exactly how to re-train them when injury gets in the way.
The four players
| Region | Main movement job |
|---|---|
| Motor cortex (frontal lobe) | Sends “go” signals to muscles on the opposite side |
| Cerebellum | Smooths movement, times sequences, stores motor patterns |
| Basal ganglia | Initiates and scales movement; suppresses unwanted actions |
| Spinal cord | Final highway carrying signals to muscles; also handles reflexes |
How the brain learns a movement
- Intention - the prefrontal cortex forms a goal (“reach for the cup”).
- Planning - the premotor cortex works out the sequence of muscle activations.
- Execution - the motor cortex fires signals down the corticospinal tract.
- Feedback loop - the cerebellum compares intended with actual movement and sends tiny correction signals dozens of times per second.
- Learning - with repetition the cerebellum and basal ganglia store an efficient “motor program” so the movement becomes automatic.
This feedback-and-update cycle is why repetition matters in rehab - each rep gives the cerebellum data to refine.
What disrupts movement
- Stroke damaging the motor strip or its pathways → weakness or paralysis on one side (hemiplegia)
- Parkinson’s disease reducing dopamine in the basal ganglia → slowness, rigidity, tremor, festinating gait
- Cerebellar damage (stroke, MS, tumour) → ataxia - wide-based, lurching movement; intention tremor
- Spinal cord injury cutting pathways between brain and body → weakness or paralysis below the level of injury
- Traumatic brain injury (diffuse axonal) → slow, effortful, poorly coordinated movement
What rehab does
Constraint-Induced Movement Therapy (CIMT) restricts the stronger arm to force use of the weaker one - exploiting the repetition principle to drive cortical reorganisation. Research shows measurable gains in real-world arm use after as few as 10 intensive days.
Gait training (treadmill, overground, robotic-assisted) gives the cerebellum and basal ganglia high-volume, task-specific repetitions - and rhythmic auditory cueing (music at walking speed) synchronises the basal ganglia’s timing circuits to improve step regularity in Parkinson’s.
Mental practice / motor imagery - imagining a movement activates many of the same cortical and cerebellar circuits as physically performing it, making it a useful adjunct when physical repetitions are limited.
Why it matters in rehab
Movement rehab works because of neuroplasticity: the motor cortex literally re-maps after injury if given enough high-quality, goal-directed practice. The principle “neurons that fire together wire together” applies directly - which is why frequency and task-relevance both matter.