A system to improve vestibulo-ocular reflex (VOR) includes a display device; a head motion detector, the head motion detector being configured to detect at least one of a first angular rotational rate of a subject's head or a first acceleration of said subject's head in a first direction; a signal conditioner in communication with the head motion detector; a first gain control in communication with the signal conditioner; a second gain control in communication with the signal conditioner; a motion controller in communication with the display device and the first gain control and the second gain control; and a head motion-inducing device configured to induce a head motion on the subject. The head motion-inducing device includes a motor configured to rotate a head of the subject based on an instruction produced by a data processor.