smooth pursuit = holding the image of a moving target on the fovea
i.e. tracking a moving object, voluntarily
max velocity is about 100deg/s
requires a moving stimulus to calculate the proper eye velocity
saccade to catch up with the moving object, then smooth pursuit it at the same speed
when a stationary object starts moving, the eyes maintain their position for about 200ms before bringing the target back onto the fovea
highly stereotyped motion - a standard waveform that reflect a single smooth increase and decrease of eye velocity
involves
medial vestibular nucleus
nucleus prepositus hypoglossi
they receive projections from the cerebellar flocculus