The intertitles explain that the eyes serve as indicators of vestibular stimulation, and how the nerves in the vestibular system innervate movement of the eye towards the ear. An illustration shows the mid brain, hind brain and vestibular nerve, and various other nerves are pointed out. Animated dotted lines show the connections between various nerves and muscles. The intertitles describe nystagmus, a type of eye movement, which occurs after stimulation of the labyrinth. The eyes of a patient are shown in slow motion, performing the movements made in nystagmus. Next, horizontal nystagmus is explained using illustrations, and the patient's eyes are shown making the movements in slow motion.