Answer
Answer 6-7. With peripheral causes of vertigo (the illusion of movement), nystagmus is proportional to the amount of vertigo and nystagmus is always in the same direction regardless of the direction that the patient looks. Also, peripheral nystagmus is almost never in a vertical (up or down) direction. With central vertigo (cerebellum, vestibular nuclei and brain stem) nystagmus is usually greater than vertigo and may shift direction depending on gaze direction.