Final answer:
Tremors during motor tests can differentiate between motor disorders involving the cerebellum or cerebral motor command.
Step-by-step explanation:
The presence of tremors during specific motor tests can help differentiate between different motor disorders involving the cerebellum or the cerebral motor command. In one test, the patient extends their arms in front of them and holds the position while the examiner watches for tremors that would not be present if the muscles were relaxed. Another test involves pushing down on the arms in the extended position to check for a rebound response. The cerebellum compares the cerebral motor command with proprioceptive feedback and adjusts the descending input to correct any changes. The red nucleus also sends additional signals to increase contraction momentarily and regain the original arm position.