Figure 2. Nystagmus on stage N1 sleep.
On PSG, EOG showing conjugate vertical lower frequency eye movements of 2.5 Hz during stage N1. Also noted are slow rolling eye movements in the first part of the epoch. The movements are transmitted to the F3-M2 and F4-M1 channels, represented by high amplitude waves. EOG = electrooculogram, PSG = polysomnography.
