Topic: smooth function approximation

The cerebellum is critically involved in motor control, refining trajectories as movements are being executed. This requires fast, online learning. What features of cerebellar circuit structure make it particularly suited to online learning? The cerebellum has a distinctive circuit architecture in which each mossy fibre input typically projects to 250 granule cells, a population that comprises more than half of the neurons in the brain. Each granule cell forms ~4 synapses with mossy fibres. The main hypotheses for this sparse input expansion are that it facilitates pattern separation1 and smoo