A seat assembly for a vehicle, the assembly comprising a seat having a frame portion and a rigid control body coupled to the frame portion in a movable manner relative to the frame portion with at least four possible distinct movements, wherein the seat further has a backrest to support the back of a user and a base transversal to the backrest to support the lower limbs of the user, the backrest and the base each being independently rotatable around a pitch axis, the seat assembly comprising driving means configured to translate the seat along a first direction, translate the seat along a second direction distinct from the first direction, rotate the base and rotate the backrest in response to said four movements, respectively.