Figure 1. Video-oculography findings of the right eye during the first session (before beginning with memantine); the x-axis represents time in milliseconds and the y-axis represents the eye position; a) Horizontal component of the pendular nystagmus in the right eye in one trial while examining the visual acuity before and after stimulus; b) Vertical component of the same trial; c) Horizontal component of the pendular nystagmus in the right eye in all 32 trials (superimposed grey lines) with a black line indicating the mean horizontal component of the APN; d) Corresponding vertical eye movements. Vertical dashed line represents the end of the blink preceded by the lightly shaded bar reflecting the period of the blink. The period during which the visual acuity stimulus was presented is indicated by the black bar. Note the suppression of the nystagmus and the consistent resetting of the phase of the oscillations with blinks (c, second column).