Cervical test methodology
Trunk rotates sinusoidaly (60o to both sides, peak velocity 60 o/sec, 0,1 Hz) with head fixed by technician. For the sake of safety no mechanical fixation is used. The movement of the chair starts to the left side (i.e.relative movement of the head to the right) - dynamic phase, and after three cycles stops in the leftmost position for 20 seconds - static phase.
Rotation to the rightmost position with the second static phase for 20 seconds and finally another 3 cycles of the second dynamic phase. The eye movements are recorded by conventional DC electronystagmography from binocular horizontal derivation in darkness with eyes open.