Which is a typical symptom of cerebellar involvement?

• A. Overshooting or undershooting
• B. Rigidity during voluntary motions
• C. Spasticity during involuntary action
• D. Word-finding difficulty

Answer: (A)

Movement coordination hinges on the cerebellum to fine-tune direction, speed, and force of actions. When the cerebellum is involved, signals for where the limb is headed become imprecise, so you see dysmetria—overshooting or undershooting the intended target. This shows up most clearly when reaching for something or performing finger-to-nose tasks, where the movement doesn’t land where planned.

Rigidity during voluntary motions points to basal ganglia problems, not cerebellar ones, and spasticity reflects upper motor neuron pathway issues. Word-finding difficulty involves language areas of the brain, which are separate from the cerebellum. So overshooting or undershooting is the hallmark sign of cerebellar involvement.