Catatonia features:

• A. Tremor limited to the fingers.
• B. Stupor, mutism, negativism, rigidity, or posturing.
• C. Rapid rhythmic movements.
• D. Fluctuating coarse tremor.

Answer: (B)

Catatonia is defined by a marked psychomotor disturbance, where the person may become unresponsive and immobile or show rigid, statue-like postures. Classic features include stupor or mutism (reduced or no verbal output), negativism (opposition or refusal to follow instructions), rigidity, and posturing. These signs reflect a disruption in motor behavior and engagement with the environment, which is distinct from other movement phenomena.

Tremor restricted to the fingers, rapid rhythmic movements, or fluctuating coarse tremor do not fit this pattern. Those signs point to other motor disorders such as tremor disorders or chorea and do not capture the characteristic immobility, mutism, and rigidity seen in catatonia.