Question

which of the following is a characteristic of dystonia? slow movements sustained muscle contractions rigidity tremor at rest

Explanation:

Dystonia is a movement disorder characterized by involuntary sustained muscle contractions. Slow movements are associated with bradykinesia (e.g., in Parkinson's). Rigidity is also seen in Parkinson's. Tremor at rest is a classic sign of Parkinson's disease.

Answer:

Sustained muscle contractions