Limb weighting for ataxia is described as:

• A. May improve single joint movement control
• B. Does NOT improve multi-joint coordination
• C. Both A and B are true
• D. Has no effect

Answer: (C)

Limb weighting changes the dynamics of the arm, adding inertia and altering proprioceptive feedback. In ataxia, this can make single-joint movements more stable and controllable because the extra load dampens rapid, noisy fluctuations at one joint, helping the target movement be smoother and more precise.

However, coordinating multiple joints relies on the cerebellum to time and sequence intersegmental movements. The added weight doesn’t fix those timing and coordination issues across joints, so multi-joint coordination doesn’t reliably improve with weighting. In other words, you can get better control at a single joint, but the broader, multi-joint coordination remains unchanged or may even be hindered by the added inertia.

So limb weighting is described as potentially improving single-joint movement control while not improving multi-joint coordination. The idea that it has no effect is too absolute, because there can be domain-specific benefits, particularly at the single-joint level.