Smooth pursuit eye movements are how your brain tracks moving objects smoothly, like watching a bird fly or a car pass by. These tiny tracking circuits run through the frontal lobes, parietal lobes, brainstem, and cerebellum—making them highly vulnerable in concussions. That’s why testing smooth pursuit is one of the most sensitive bedside tools for diagnosing concussion. And when visual tracking improves through rehab, it’s not just eye movement getting better—it’s the brain functioning better.