The cerebellum and neural networks for rhythmic sensorimotor synchronization in the human brain.

Sensorimotor synchronization (SMS) is the rhythmic synchronization between a timed sensory stimulus and a motor response. This rather simple function requires complex cerebral processing whose basic mechanisms are far from clear. The importance of SMS is related to its hypothesized relevance in motor recovery following brain lesions. This is witnessed by the large number of studies in different disciplines addressing this issue. In the present review we will focus on the role of the cerebellum by referring to the general modeling of SMS functioning. Although at present no consensus exists on cerebellar timekeeping function it is generally accepted that cerebellar input and output flow process time information. Reviewed data are considered within the framework of the 'sensory coordination' hypothesis of cerebellar functioning. The idea that timing might be within the parameters that are under cerebellar control to optimize cerebral cortical functioning is advanced.