[Verse 1] Picture the river inside your skull, middle cerebral artery, pressure and pull, a clot parks itself where the fibers run deep, internal capsule, that's a narrow street. M1 goes dark, the output's cut, corticospinal highway stuck in a rut, the wires cross at the brainstem's gate, so damage on the right makes the left arm wait. [Chorus] Opposite sides, that's the cardinal rule, cross the bridge, that's the brainstem's school, seventy percent, write it on your hand, the proportional rule helps you understand, six months ticking, the window's wide, plasticity's clock is running, don't let it slide. [Verse 2] Doctors watch close in the opening months, synapses sprouting like eager little stunts, sensitive period, the brain's wide awake, soon after stroke is the moment to take. Old maps redrawing, new paths get laid, premotor cortex steps up, unafraid, the healthy hemisphere lends a hand, reticulospinal tracts quietly expand. [Chorus] Opposite sides, that's the cardinal rule, cross the bridge, that's the brainstem's school, seventy percent, write it on your hand, the proportional rule helps you understand, six months ticking, the window's wide, plasticity's clock is running, don't let it slide. [Verse 3] Edward Taub had a stubborn idea, sling up the good arm, make the weak one appear, constraint-induced, force the hand to try, shadow limb grounded while the other learns to fly, hours of practice, not a moment of rest, turning the neglect into the body's new test, TMS maps show the cortex redraw, proof on a screen of the plasticity law. [Bridge] From a flickering pulse on a magnetic coil, to a patient gripping a cup without turmoil, the lab and the ward are singing one song, rewiring the broken, making weak become strong. [Verse 4] Mirror therapy tricks the watching eye, reflection moving where the paralysis lies, the brain believes the glass it sees, borrowed movement coaxes stillness to ease. Robotic exoskeletons track the arm, teaching rhythm, keeping tremors calm, biofeedback loops close the gap between, intention and the motor map unseen. Every twitch is a synapse's cheer, proof that the nervous system still can steer, therapists charting each small degree, patience and science working to set limbs free. [Chorus] Opposite sides, that's the cardinal rule, cross the bridge, that's the brainstem's school, seventy percent, write it on your hand, the proportional rule helps you understand, six months ticking, the window's wide, plasticity's clock is running, don't let it slide. [Outro] Restrain the good, awaken the still, the brain finds a detour up the opposite hill, hemiparesis isn't the end of the tale, compensation pathways, lifting the scale.
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