Rebound phenomenon is most closely associated with which description?

• A. Tremor
• B. Hypotonia
• C. Halt of forceful active movements when resistance is removed
• D. Inability to perform rapid alternating movements

Answer: (C)

Rebound phenomenon reflects cerebellar motor control problems—the ability to finely dampen and terminate a planned movement when external force is suddenly removed is impaired. In practice, when you apply resistance to a limb and then release, a person with a rebound sign may show a quick, abrupt change in the movement or a sudden halt, rather than a smooth, controlled cessation. This happens because the cerebellum normally helps shut off the agonist and regulate the antagonist to stop the movement at the right moment; when this control is disrupted, the response after removing resistance is abrupt or exaggerated.

The other options don’t describe this cerebellar‑driven response: tremor is a rhythmic oscillation, hypotonia is low muscle tone, and difficulty with rapid alternating movements points to dysdiadochokinesia rather than the rebound response.