Which of the following is NOT a function of the cerebellum?

The cerebellum plays a critical role in motor control and coordination. It helps to coordinate voluntary movements, maintains posture, and significantly contributes to motor learning by integrating sensory input and motor commands.

The correct answer highlights that the cerebellum does not specifically function to compare two copies of a motor program from the motor cortex; rather, this function is better attributed to other brain regions, including the cerebral cortex itself, which processes and sends motor commands. The cerebellum does, however, assist in fine-tuning these commands by integrating sensory feedback and adjusting movements accordingly, but it is not directly comparing the motor program outputs from the motor cortex on its own. Therefore, the option emphasizing this direct comparison does not accurately represent a primary function of the cerebellum, distinguishing it from the other listed functions that it does actively perform.