Final answer:
The loss of ability to execute previously learned motor activities is associated with lesions of the cerebellum.
Step-by-step explanation:
Loss of ability to execute previously learned motor activities (which is not the result of demonstrable weakness, ataxia or sensory loss) is associated with lesions of the cerebellum. The cerebellum plays an important role in coordinating and fine-tuning voluntary movements. Damage to the cerebellum can result in a variety of motor deficits, including the loss of previously learned motor activities.